• In Stock
  • Sold by Newegg
  • Make an Offer
  • New
Department
Show More
Brands
Show More
Price
Show More
Type
Show More
Max Resolution
Camera inputs
Bundled Camera Number
Camera Type
Built-In HDD
All Top Brands
Availability
Condition
Current Promotion
Sold by
Useful Links
Customer Ratings
avatar

Any questions? Our AI beta will help you find out quickly.

Sort By:
View:
Reolink 4K PoE NVR 8 Channel Pre-Installed 2TB Hard Drive 4K/5MP/4MP/1080P HD 24/7 Surveillance Recording Home Security Camera System Video Recorder RLN8-410
Quick View
in 30 days
Reolink 4K PoE NVR 8 Channel Pre-Installed 2TB Hard Drive 4K/5MP/4MP/1080P HD 24/7 Surveillance Recording Home Security Camera System Video Recorder RLN8-410

Limited time offer, ends 10/06

  • Series: PoE NVR
  • Channel: 8 Channel
  • Supported Protocols: HTTP, TCP/IP, UDP, DHCP, P2P, UPNP, RTSP, SMTP, SSL/TLS, DNS, DDNS, NTP, FTP
  • Network Interface: • 1, RJ-45 10/100 Mbps Self-Adaptive Ethernet Interface for LAN/WAN • 8, RJ-45 10/100 Mbps Self-Adaptive PoE Ethernet Interface for IP Camera
  • Model #: RLN8-410-2T
  • $259.99
  •  
  • $203.99 
  • Save: $56.00 (21%)
  • Free Shipping
Available Direct from Reolink Available Direct from Reolink
REOLINK 36 Channel 12MP PoE NVR Video Recorder, Capacity Up to 48TB Supports 6K 4K 5MP 4MP PoE/WiFi Cameras, Alarm In/Out 2-Way Audio, RLN36 with 2 PoE Switch No HDD
Quick View
REOLINK 36 Channel 12MP PoE NVR Video Recorder, Capacity Up to 48TB Supports 6K 4K 5MP 4MP PoE/WiFi Cameras, Alarm In/Out 2-Way Audio, RLN36 with 2 PoE Switch No HDD

Limited time offer, ends 10/06

  • Series: Network Video Recorder
  • Part Number: RLN36 with PoE Switch
  • Channel: 36
  • Supported Protocols: HTTP, TCP/IP, UDP, DHCP, P2P, UPNP, RTMP, SMTP, SSL/TLS, DNS, DDNS, NTP
  • Model #: RLN36 with PoE Switch
  •  
  • $263.49 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink 4K HD Surveillance WiFi Camera System 8MP Auto Tracking for 24/7 Person/Vehicle/Animal Detection, 4Pcs 2.4/5GHz Dual-Band Wi-Fi 6 PT Cameras with 12-Channel NVR 2TB HDD
Quick View
Reolink 4K HD Surveillance WiFi Camera System 8MP Auto Tracking for 24/7 Person/Vehicle/Animal Detection, 4Pcs 2.4/5GHz Dual-Band Wi-Fi 6 PT Cameras with 12-Channel NVR 2TB HDD

Limited time offer, ends 10/06

  • Type: Surveillance System / Security Camera Kit
  • Resolution Recording: 8 Megapixels
  • Recording Frame Rate: 1 ~ 25 FPS
  • Storage Capacity: 2TB HDD
  • Model #: NE-RLK12-800WPT4-US
  •  
  • $509.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink Home Hub with 2x Argus PT and Solar Panel 5MP Wireless Wi-Fi Solar Battery Camera with Pan & Tilt Color Night Vision, White
Quick View
Reolink Home Hub with 2x Argus PT and Solar Panel 5MP Wireless Wi-Fi Solar Battery Camera with Pan & Tilt Color Night Vision, White

Limited time offer, ends 10/06

  • Brand: Reolink
  • Part Number: Home Hub with 2x Argus PT White+SP
  • Bundled Camera Number: 2 Cameras
  • Camera Type: Pan&Tilt
  • Model #: Home Hub with 2x Argus PT White+SP
  •  
  • $271.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Sponsored
Reolink 8CH 4K Security Camera System, 8pcs 8MP Smart Person/Vehicle Detection Wired Outdoor PoE IP Cameras and 8CH 2TB HDD NVR for 24/7 Recording, Remote Access - RLK8-810B8-A
Quick View
Reolink 8CH 4K Security Camera System, 8pcs 8MP Smart Person/Vehicle Detection Wired Outdoor PoE IP Cameras and 8CH 2TB HDD NVR for 24/7 Recording, Remote Access - RLK8-810B8-A

Limited time offer, ends 10/06

  • Type: NVR Kit
  • Built-In HDD: 2TB
  • Storage Capacity: 12TB HDD
  • Bundled Camera Number: 8
  • Model #: RLK8-810B8-A
  •  
  • $783.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Sponsored
REOLINK 4K 12CH WiFi NVR with Wi-Fi 6 and 2.4/5 GHz Dual-Band WiFi, Built-in 2TB HDD, Support 16MP/12MP/8MP/5MP/4MP Reolink Cameras, 24/7 Recording Home Security Camera System, Not PoE Ports, RLN12W
Quick View
REOLINK 4K 12CH WiFi NVR with Wi-Fi 6 and 2.4/5 GHz Dual-Band WiFi, Built-in 2TB HDD, Support 16MP/12MP/8MP/5MP/4MP Reolink Cameras, 24/7 Recording Home Security Camera System, Not PoE Ports, RLN12W

Limited time offer, ends 10/06

  • Series: Reolink 12Ch 8K WIFI NVR
  • Channel: 12 Channel
  • Supported Protocols: HTTPS, TCP/IP, UDP, DHCP, P2P, UPNP, RTMP, RTSP, SMTP, SSL/TLS, DNS, DDNS, NTP, FTP
  • Network Interface: 4 x RJ-45, 10/100 Mbps self-adaptive (for IP cameras) 1 x RJ-45, 10/100 Mbps self-adaptive (for LAN/WAN)
  • Model #: RLN12W
  • $229.99
  •  
  • $203.99 
  • Save: $26.00 (11%)
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink 8CH NVR 2TB HDD Built-in, Support up to 12MP, 8-Channel PoE NVR for 24/7 Continuous Recording
Quick View
Reolink 8CH NVR 2TB HDD Built-in, Support up to 12MP, 8-Channel PoE NVR for 24/7 Continuous Recording

Limited time offer, ends 10/06

  • Bundled Camera Number: Add-on Camera
  • Color: Black
  • Pixels: 8 MP
  • Model #: PN-8
  •  
  • $203.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink 8CH NVR + 4pcs 8MP POE Cameras Bundled, 24/7 8MP Surveillance System Kit, Human/Car Detection 5X Optical Zoom with Spotlight, 2-Way Talk, Color Night Vision, H.265 2TB HDD Built-in, Up to 12TB
Quick View
  •  
  • $631.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Sponsored
Reolink 16CH NVR 4TB HDD Built-in, Support up to 12MP, 16-Channel PoE NVR for 24/7 Continuous Recording
Quick View
Reolink 16CH NVR 4TB HDD Built-in, Support up to 12MP, 16-Channel PoE NVR for 24/7 Continuous Recording

Limited time offer, ends 10/06

  • Bundled Camera Number: Add-on Camera
  • Color: Black
  • Model #: PN-16
  •  
  • $288.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
REOLINK 36 Channel 12MP PoE NVR Video Recorder, Capacity Up to 48TB Supports 6K 4K 5MP 4MP PoE/WiFi Cameras, Alarm In/Out 2-Way Audio
Quick View
REOLINK 36 Channel 12MP PoE NVR Video Recorder, Capacity Up to 48TB Supports 6K 4K 5MP 4MP PoE/WiFi Cameras, Alarm In/Out 2-Way Audio

Limited time offer, ends 10/06

  • Series: Network Video Recorder
  • Part Number: PN12M-36
  • Channel: 36
  • Supported Protocols: HTTP, TCP/IP, UDP, DHCP, P2P, UPNP, RTMP, SMTP, SSL/TLS, DNS, DDNS, NTP
  • Model #: PN12M-36
  •  
  • $159.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink 16CH 4K PoE Security Camera System, 16pcs 8MP IP Camera Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-810B16-A
Quick View
Reolink 16CH 4K PoE Security Camera System, 16pcs 8MP IP Camera Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-810B16-A

Limited time offer, ends 10/06

  • Part Number: RLK16-810B16-A
  • Type: NVR Kit
  • Camera Type: IP Camera
  • ONVIF: Yes
  • Model #: RLK16-810B8-A+810A*8
  •  
  • $1,463.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Sponsored
Reolink RLC-1212A-3Pack 12MP Ultra HD PoE Outdoor Security Camera, Color Night Vision, Human/Vehicle Detection, Two Way Talk, Timelapse, Work with Smart Home Support Micro SD Card(Max.256G)/NVR/FTP
Quick View
Reolink RLC-1212A-3Pack 12MP Ultra HD PoE Outdoor Security Camera, Color Night Vision, Human/Vehicle Detection, Two Way Talk, Timelapse, Work with Smart Home Support Micro SD Card(Max.256G)/NVR/FTP

Limited time offer, ends 10/06

  • Brand: Reolink
  • Bundled Camera Number: 3 Cameras
  • Camera Type: 1 Camera Kit
  • Network Camera: Yes
  • Model #: NE-1212A-3P
  •  
  • $300.29 
  • Free Shipping
Available Direct from Reolink Available Direct from Reolink
Reolink 8CH NVR + 4pcs 8MP POE Cameras Bundled, 24/7 8MP Surveillance System Kit, Human/Car Detection 5X Optical Zoom with Spotlight, 2-Way Talk, Color Night Vision, H.265 2TB HDD Built-in, Up to 12TB
Quick View
  •  
  • $631.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink 4K HD Surveillance WiFi Camera System 8MP Auto Tracking for 24/7 Person/Vehicle/Animal Detection, 4Pcs 2.4/5GHz Dual-Band Wi-Fi 6 PT Cameras with 12-Channel NVR 2TB HDD
Quick View
Reolink 4K HD Surveillance WiFi Camera System 8MP Auto Tracking for 24/7 Person/Vehicle/Animal Detection, 4Pcs 2.4/5GHz Dual-Band Wi-Fi 6 PT Cameras with 12-Channel NVR 2TB HDD

Limited time offer, ends 10/06

  • Type: Surveillance System / Security Camera Kit
  • Resolution Recording: 8 Megapixels
  • Recording Frame Rate: 1 ~ 25 FPS
  • Storage Capacity: 2TB HDD
  • Model #: NE-RLK12-800WPT4-US
  •  
  • $509.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Sponsored
Reolink 16CH PoE Security Camera System, 16pcs 4K IP Camera RLC-840A Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-840V16-A
Quick View
Reolink 16CH PoE Security Camera System, 16pcs 4K IP Camera RLC-840A Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-840V16-A

Limited time offer, ends 10/06

  • Part Number: RLK16-840V16-A
  • Type: NVR Kit
  • Camera Type: IP Camera
  • Resolution Recording: 8 Megapixels
  • Model #: RLK16-840V16-A
  •  
  • $1,591.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Sponsored
Reolink 8CH 4K Outdoor Security Camera System, 6pcs 8MP Smart Person/Vehicle Detection Wired PoE IP Dome Cameras, 8CH 2TB HDD NVR for 24/7 Recording Remote Access, RLK8-820D6-A
Quick View
Reolink 8CH 4K Outdoor Security Camera System, 6pcs 8MP Smart Person/Vehicle Detection Wired PoE IP Dome Cameras, 8CH 2TB HDD NVR for 24/7 Recording Remote Access, RLK8-820D6-A

Limited time offer, ends 10/06

  • Series: Reolink PoE Kit with Person/Vehicle Detection
  • Type: Surveillance System / Security Camera Kit
  • Camera Type: IP Camera
  • Video Input: PoE IP Camera x 8
  • Model #: RLK8-820D6-A
  •  
  • $631.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Sponsored
Reolink Home Hub with Argus PT and Solar Panel 5MP Wireless Wi-Fi Solar Battery Camera with Pan & Tilt Color Night Vision, White
Quick View
Reolink Home Hub with Argus PT and Solar Panel 5MP Wireless Wi-Fi Solar Battery Camera with Pan & Tilt Color Night Vision, White

Limited time offer, ends 10/06

  • Brand: Reolink
  • Part Number: Home Hub with 1x Argus PT White+SP
  • Bundled Camera Number: 1 Camera
  • Camera Type: Pan&Tilt
  • Model #: Home Hub with 1x Argus PT White+SP
  •  
  • $175.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Sponsored
Reolink 16CH PoE Security Camera System, 16pcs 4K IP Camera RLC-840A Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-840V16-A
Quick View
Reolink 16CH PoE Security Camera System, 16pcs 4K IP Camera RLC-840A Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-840V16-A

Limited time offer, ends 10/06

  • Part Number: RLK16-840V16-A
  • Type: NVR Kit
  • Camera Type: IP Camera
  • Resolution Recording: 8 Megapixels
  • Model #: RLK16-840V16-A
  •  
  • $1,591.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink 16CH PoE Security Camera System, 16pcs 5MP IP Camera Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-510B16-A
Quick View
Reolink 16CH PoE Security Camera System, 16pcs 5MP IP Camera Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-510B16-A

Limited time offer, ends 10/06

  • Part Number: RLK16-510B16-A
  • Type: NVR Kit
  • Camera Type: IP Camera
  • Resolution Recording: 4 Megapixels
  • Model #: RLK16-510B16-A
  •  
  • $1,079.49 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink RLK12-500WB4 5MP WiFi Surveillance Cameras System with 24/7 Recording, 4Pcs 2K+ Security IP Camera 12CH NVR with 1TB HDD Smart Person Vehicle Animal Detection
Quick View
Reolink RLK12-500WB4 5MP WiFi Surveillance Cameras System with 24/7 Recording, 4Pcs 2K+ Security IP Camera 12CH NVR with 1TB HDD Smart Person Vehicle Animal Detection

Limited time offer, ends 10/06

  • Type: Surveillance System / Security Camera Kit
  • Recording Frame Rate: 1 ~ 25 FPS
  • Storage Capacity: 1TB HDD
  • Network Connection: RJ45
  • Model #: RLK12-500WB4
  • $349.99
  •  
  • $339.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink RLK8-800PT4 PoE PT Outdoor Surveillance System 4K Color Night Vision 360° Coverage with Auto Tracking Human/Vehicle/Animal Detection 8-Channel 2TB NVR 24/7 Recording
Quick View
Reolink RLK8-800PT4 PoE PT Outdoor Surveillance System 4K Color Night Vision 360° Coverage with Auto Tracking Human/Vehicle/Animal Detection 8-Channel 2TB NVR 24/7 Recording

Limited time offer, ends 10/06

  • Type: NVR Kit
  • Video Input: PoE IP camera x 8
  • Audio Input: Cameras with built-in mic
  • Resolution Recording: 8 Megapixels
  • Model #: RLK8-800PT4
  •  
  • $479.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink RLK8-1200V4 12MP IK10 PoE Surveillance Security Camera System with 145° View Spotlight Night Vision, 4pcs 12MP IK10 Vandal-Proof Camera, 8 Channel NVR with 2TB HDD 24/7 Recording
Quick View
Reolink RLK8-1200V4 12MP IK10 PoE Surveillance Security Camera System with 145° View Spotlight Night Vision, 4pcs 12MP IK10 Vandal-Proof Camera, 8 Channel NVR with 2TB HDD 24/7 Recording

Limited time offer, ends 10/06

  • Type: Surveillance System / Security Camera Kit
  • Resolution Recording: 12 Megapixels
  • Recording Frame Rate: 1 ~ 25 FPS
  • Storage Capacity: 2TB HDD
  • Model #: RLK8-1200V4
  • $829.99
  •  
  • $579.99 
  • Save: $250.00 (30%)
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink 16CH 6K PoE Security Camera System, 16pcs 12MP IP Camera Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-1212B16-A
Quick View
Reolink 16CH 6K PoE Security Camera System, 16pcs 12MP IP Camera Human/Car Detect, IP66 Waterproof +1pc 16CH H.265 NVR Pre-Installed 4TB HDD (Include 16pcs 18M Cat5 Cables) - RLK16-1212B16-A

Limited time offer, ends 10/06

  • Type: NVR Kit
  • Camera Type: IP Camera
  • Resolution Recording: 12 Megapixels
  • Recording Frame Rate: 1 ~ 25 FPS
  • Model #: RLK16-1212B16-A
  •  
  • $2,099.49 
  • Free Shipping
Available Direct from Reolink Available Direct from Reolink
REOLINK 16CH 12MP PoE Security Camera System, 8 Bullets H.265 12MP Cameras with Person/Vehicle Detection and Spotlights,16CH NVR with 4TB HDD for 24-7 Recording
Quick View
REOLINK 16CH 12MP PoE Security Camera System, 8 Bullets H.265 12MP Cameras with Person/Vehicle Detection and Spotlights,16CH NVR with 4TB HDD for 24-7 Recording

Limited time offer, ends 10/06

  • Type: NVR Kit
  • Camera Type: IP Camera
  • Resolution Recording: 12 Megapixels
  • Storage Capacity: 12TB HDD
  • Model #: PS6KB01-16
  •  
  • $999.99 
  • Free Shipping
Available Direct from Reolink Available Direct from Reolink
Reolink 8CH 4K Security Camera System 4pcs 8MP Smart Person/Vehicle Detection Wired Outdoor PoE IP Cameras and 8CH 2TB HDD NVR for 24/7 Recording, Remote Access
Quick View
Reolink 8CH 4K Security Camera System 4pcs 8MP Smart Person/Vehicle Detection Wired Outdoor PoE IP Cameras and 8CH 2TB HDD NVR for 24/7 Recording, Remote Access
  • Series: Reolink PoE Kit with Person/Vehicle Detection
  • Type: NVR Kit
  • Camera Type: IP Camera
  • Video Input: PoE IP Camera x 8
  • Model #: RLK8-810B4-A
  • $559.99
  •  
  • $447.98 
  • Save: $112.01 (20%)
  • Free Shipping
Available Direct from Reolink Available Direct from Reolink
REOLINK 8CH 4K PTZ Security System, 2pcs Trackmix PoE, IP PoE Outdoor Cameras 6X Hybrid Zoom, Auto Tracking, Human/Vehicle/Pet Detection +1pc RLN8-410 8CH NVR with Built-in 2TB HDD H.265
Quick View
REOLINK 8CH 4K PTZ Security System, 2pcs Trackmix PoE, IP PoE Outdoor Cameras 6X Hybrid Zoom, Auto Tracking, Human/Vehicle/Pet Detection +1pc RLN8-410 8CH NVR with Built-in 2TB HDD H.265

Limited time offer, ends 10/06

  • Series: 8CH NVR Kit
  • Type: NVR Kit
  • Camera Type: IP Camera
  • Video Input: 8 x RJ-45
  • Model #: NE-8-TrackMixB2-A
  •  
  • $511.99 
  • Free Shipping
Available Direct from Reolink Available Direct from Reolink
REOLINK RLK8-1200D4-A 12MP 8CH PoE Security System, 4pcs H.265 12MP Domes Cameras Wired, Person/Vehicle/Pet Detection 2-Way Talk Spotlights Color Night Vision, 8CH NVR with 2TB HDD
Quick View
REOLINK RLK8-1200D4-A 12MP 8CH PoE Security System, 4pcs H.265 12MP Domes Cameras Wired, Person/Vehicle/Pet Detection 2-Way Talk Spotlights Color Night Vision, 8CH NVR with 2TB HDD

Limited time offer, ends 10/06

  • Series: 12MP PoE NVR Kit
  • Type: NVR Kit
  • Camera Type: IP Camera
  • Built-In HDD: 2TB
  • Model #: NE-8-1200D4-A
  •  
  • $590.99 
  • Free Shipping
Available Direct from Reolink Available Direct from Reolink
Reolink 16CH 4K Security Camera System, 8pcs 8MP Smart Person/Vehicle Detection Wired Outdoor Audio PoE IP Cameras,16CH 4TB HDD NVR for 24/7 Recording, RLK16-810B8-A
Quick View
Reolink 16CH 4K Security Camera System, 8pcs 8MP Smart Person/Vehicle Detection Wired Outdoor Audio PoE IP Cameras,16CH 4TB HDD NVR for 24/7 Recording, RLK16-810B8-A

Limited time offer, ends 10/06

  • Series: Reolink PoE Security Camera System with Person/Vehicle Detection
  • Type: NVR Kit
  • Camera Type: IP Camera
  • Video Input: PoE IP Camera x 16
  • Model #: RLK16-810B8-A_1
  •  
  • $943.49 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink 8CH 24/7 Surveillance System Kit, 4 pcs 4K Ultra HD RLC-833A, 3X Optical Zoom with Spotlights, Human/Vehicle/Pet Detect, 2-Way Audio, IP66  Bundled with RLN8-410 8CH NVR with 2TB HDD Installed
Quick View
  •  
  • $509.99 
  • Free Shipping
Direct from Reolink Direct from Reolink
Reolink 5MP 8CH PoE Security System, 8pcs 5MP Wired PoE IP Cameras Outdoor, Smart Person/Vehicle Detection, 6K 8CH NVR with 2TB HDD for 7/24 Recording - RLK8-510B8-A
Quick View
Reolink 5MP 8CH PoE Security System, 8pcs 5MP Wired PoE IP Cameras Outdoor, Smart Person/Vehicle Detection, 6K 8CH NVR with 2TB HDD for 7/24 Recording - RLK8-510B8-A

Limited time offer, ends 10/06

  • Type: NVR Kit
  • Camera Type: IP Camera
  • Video Input: 8 x RJ-45
  • Video Output: 1 x VGA, 1 x HDMI
  • Model #: RLK8-510B8-A
  •  
  • $594.99 
  • Free Shipping
Available Direct from Reolink Available Direct from Reolink