What sort of power adapter does this have? Will it work in a country that has 220v mains power?

The power adapter that mine came with says on the label "100-240 volts input". However it has a US type plug so you may need an adapter for the plug. Hope that helps.

will this work with a cc crane super usb wifi antenna 3?

The antenna will work so as long as it has an re-start connector. This router would be excellent if the port forwarding worked as it doesn't currently due to a firmware issue from t-bone of which I had to call Taiwan only to get poor support. Until they correct the firmware....BUY ANOTHER COMPARABLE ROUTER with a detachable antenna.

Hi how can i expand the range of the tp link tl mr3220? Can i remove the antenna and put one with a higher gain?

You can replace the RP-SMA removable antenna on the back and install a 9dBi High Gain Omni Antenna which should give pretty good range for a consumer Access Point with an output of 26dBm (400mW).

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TP-Link TL-MR3220 3G/3.75G Wireless Router Compatible with 3G USB Modems IEEE 802.11b/g/n

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Work with UMTS/HSPA/EVDO 3G modems
3G/WAN failover keeps you "always-online"
Up to 150Mbps Wireless

Overview

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Model
Brand	TP-Link
Model	TL-MR3220

Details
Standards	IEEE 802.11b/g/n
Device Management	Web Based Configuration(HTTP), SNMP v1/2c, Web Based Firmware Upgrade.
Security	Support 64/128 bit WEP, WPA-PSK/WPA2-PSK, Wireless MAC Filtering
WPA	WPA2
WAN Ports	1 x 10/100M
LAN Ports	4 x 10/100M
Wireless Data Rates	Up to 150Mbps
Modulation	DBPSK, DQPSK, CCK, OFDM, 16-QAM, 64-QAM
Frequency Band	2.4 GHz - 2.4835 GHz
Antenna	5dBi External Antenna
Transmitted Power	<20dBm(EIRP)
Interface	USB 2.0
Power Supply	9VDC / 0.85A
Wireless Adapter included	No
System Requirements	Microsoft Windows 98SE, NT, 2000, XP, Vista or Windows 7, MAC OS, NetWare, UNIX or Linux
Dimensions	6.9" x 4.4" x 1.2"
Temperature	0°C - 40°C (32°F - 104°F)
Humidity	10% - 90% (Non-Condensing)

Features
Features	Compatible with UMTS/HSPA/EVDO USB 3G modems, tested in the field. 3G/WAN failover guarantees an "always-online" Internet connection. Supports PPPoE, Dynamic IP, Static IP, PPTP, L2TP Cable Internet access. SST technology dramatically increases link robustness and stability. CCA technology enhances your signal stability by automatically avoiding channel conflicts. Wireless security encryption easily at the push of the QSS button. WDS wireless bridge provides seamless bridging to expand your wireless network. IP based bandwidth control allows administrators to determine how much bandwidth is allotted to each PC.

Packaging
Package Contents	3G/3.75G Wireless N Router 1 Antenna Power supply unit Ethernet Cable Resource CD Quick Installation Guide

Additional Information
First Listed on Newegg	April 04, 2011

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Limited Warranty period (parts): 2 years
Limited Warranty period (labor): 2 years
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Return for refund within: 45 days
Return for replacement within: 1 year
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Manufacturer Contact Info

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Support Phone: 1-866-225-8139
Support Email: [email protected]
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TP-Link TL-MR3220 3G/3.75G Wireless Router Compatible with 3G USB Modems IEEE 802.11b/g/n

Learn more about the TP-Link TL-MR3220

Customer Reviews of the TP-Link TL-MR3220

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16833704072

TP-Link TL-MR3220 3G/3.75G Wireless Router Compatible with 3G USB Modems IEEE 802.11b/g/n

Learn more about the TP-Link TL-MR3220

Customer Reviews of the TP-Link TL-MR3220

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info