Detailed Product Description

Features: 
1) Desktop, for indoor use, DUAL LCD screens with bakground light
2) Industrial GSM module for 900/1800 Mhz, or 800/1800/1900 Mhz,
3) Support Lock payphone, SIM card, Network, Cell and LAC
4) Support pre-paid function and add IP. 
5) 100-240 V AC power and 1500mAh built-in rechargable Li battery for 48 hours stand-by
time
6)  Support print-out bills and records by connected printer
7)  Supervised by internet based management system.