Myamplifiers.com offers AT6200GW. Learn advantages of this dual band mobile amplifier here http://www.myamplifiers.com/cellular_phone_amplifier_at6200gw.html .The peculiarity of AnyTone AT6200 GW dual band cellular phone amplifier is the possibility to improve both GSM (900MHz) and 3G(2100MHz) signal at the same time.<br />The dual band mobile amplifier is ideal for creating convenient communication environment in large areas up to 500 m2.