TT-576 Indoor GSM Coin Payphone TT-576 indoor GSM coin payphone provides 2 liters big cash box. Coin slot supports 5 coins storage and smart refund. Use high-quality dual band 900/1800 or 850/1900 MHz module to connect with GSM network. 128*64 dots large LCD can display various information and advertisement. SMS function and backup battery can be supported. For details, please refer to product catalog. Feature ?Using high-quality GSM module for 850/900/1800/1900MHz (option) network ?Robust ABS housing against vandalism ?128 x 64 dots large graphic LCD screen with backlight can display various messages and advertisement information. ?Multiple languages (option) ?Normal call, Emergency call, Service call, Incoming call, Follow-on, redial ?Self-diagnosis ?Remote tariff change ?Automatic PIN entry for SIM card authentication on power reset ?Supports SMS function (option) ?Remote management via PMS ?Desktop or wall mounting ?Coin recognized by material, diameter, thickness, shape ?Usable coin: - Diameter: 17~31mm - Thickness: 1.2~3.3mm ?Coin slot: - Storage capacity: 5 coins - Smart coin refund - Can distinguish 16 kinds of coins at maximum ?Cashbox: 2 liters