Features: 1.Display: With large screen LCD display, know real time information, with timing, billing, and checking functions, suitable for public telephone. 2.Stable Signal: Adopts SIM 300W module with strong signal and good stability, endure clear sound, noise free, and strong signal reception even in remote areas. 3.Fine Workmanship: Designed with received signal strength display, working status display, caller ID function, dual band GSM working mode, and has high sensitivity. 4.Easy to Operate: The operation mode is the same as that of ordinary telephone landlines, and the automatic IP function can be preset through the telephone set. 5.Practical: No need for ground wiring, easy to install, can be connected to all the voice boxes on the market, anti theft alarm host, and ordering software. Specification: Item Type: GSM Dialer_x000D_ Material: ABS_x000D_ _x000D_ Working Method: GSM 900MHz 1800MHz dual frequency_x000D_ Peak Power: 0.25W 0.5W _x000D_ Power Consumption: Static 25 mA, emission 400 mA_x000D_ Sensitivity: -104 dB_x000D_ Ambient Temperature: 0 C-+40 C_x000D_ Operating Humidity: 45 %-90%_x000D_ Atmospheric Pressure: 86-106 Pka_x000D_ Ambient Noise: