Question 1

Is it 110v or 220v?

Accepted Answer

It has a power supply that plugs into a 110v outlet. But it actually runs on 12v.

Question 2

Can I view this remotely using an app on my smartphone or tablet?

Accepted Answer

You can view your cameras remotely using an app for Android or iOS. However, I needed a firmware update which was only available by calling Zmodo before it worked properly. I've successfully used the android app on a Nexus 4 and Nexus 7 and the iOS app on an iPhone 3GS. The apps are limited and only allowed viewing the cameras and no control of recording or playback.

Question 3

audio input is listed. is recording available? are there any users of this feature?

Accepted Answer

I purchased the optional microphone and cable required to see how it works.  I can pick up and record normal voice communication from 100 ft. away if the outdoor surroundings are fairly quiet.  It will record crickets from miles away!  Yes, it does work great, clear voice recordings, and easy to set up. 
One note however: Be sure your local laws allow voice recording.  On several legal postings, I had to delete the voice recording as it is considered an invasion of privacy and can get you in very hot water.  I never could understand why video is permitted in surveillance work {in most cases} but audio is not permitted and is actually against the law.
It must be some liberal thing!

Brand	Zmodo
Model	KDA4-NARQZ4ZN-5G
Type	Kit Solution

Camera inputs	4 Channel
Video Input	4 x BNC
Audio Input	4 x RCA
Resolution Recording	Selectable: NTSC: D1(704 x 480); HD1(704 x 240); CIF (352 x 240) / PAL: D1(704 x 576); HD1(704 x 288); CIF (352 x 288)
Recording Frame Rate	NTSC: 120 fps @ D1 / PAL: 100 fps @ D1
Recording Mode	Continuous / Time Schedule / Motion Detection
Recording Compression	H.264 Level

Video Output	1 x BNC, 1 x VGA
Audio Output	1
Resolution Display	NTSC: D1 (704 x 480) / PAL: D1 (704 x 576)
Display Frame Rate	NTSC: 120 fps @ D1 / PAL: 100 fps @ D1

Storage Capacity	500GB SATA HDD, Up to 2TB
Backup Device	USB 2.0

Network Connection	RJ45, 10M/100M
Network Protocol	TCP/IP, PPPoE, DHCP and DDNS
Network Remote	LAN or Internet Browsing

Zmodo KDA4-NARQZ4ZN-5G 4Ch DVR with 500GB HDD & 4 Sony CCD Cam Kit

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Features	Video System: NTSC / PAL Recording Pack Time: 15/30/45/60mins Selectable PTZ Control: RS-485 Playback Mode: Normal Play /Fast Forward /Fast Rewind/ Frame by Frame
Operating System	Linux Based
Power Supply	DC12V, 2A
Remote Control	Yes

Bundled Camera Number	4
Bundled Camera Spec	Image Sensor: 1/4" Sony Color CCD TV System: NTSC Effective Pixels: NTSC: 510 (H) x 492 (V) Horizontal Resolution: 420 TV-Lines Lens: 3.6mm Number of IR LEDs: 24 PCS Infrared Illumination (Night Vision): up to 65ft (20m) Minimum Illumination: 0 Lux (IR On) S/N Ratio: >= 48dB Video Output: 1.0Vp-p, 75ohms (BNC) Weatherproof: Yes Power: 12V DC Dimensions (W x D x H): 3.3" x 2.5" x 2.6" Gross Weight: 0.33 lbs. Material: Metal Shell

Item#: N82E16881523045