1.Suitable for all frequencies of GSM/CDMA network, 2.Wireless and wired switch function. 3.Program by ordinary telephone 4.Can connect charging devices, PBX by optimize the circuit directly, and a lot of inner lines. 5.Support call-in numbers to display,operating like the ordinary desk-top telephone. 6.Pre-set the local code and IP special service number with pre-set PIN yard protected function. 7.Set all kinds of authorities about International,domestic and local incoming calls. 8.Display the power and signal function 9.Hold the external storage battery to charge while losing electrical power 10.Internet connection/Network management function/G3 Fax function (Optional)