Feature: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 DialerMaterial: ABS.Working Method: GSM 900MHz 1800MHz dual frequencyPeak Power: 0.25W 0.5W Power Consumption: Static 25 mA, emission 400 mASensitivity: -104 dBAmbient Temperature: 0 C-+40 COperating Humidity: 45 %-90%Atmospheric Pressure: 86-106 PkaAmbient Noise: <60 dBAntenna Overflow: 3.5dB (Omnidirectional), 12dB (Directional Optional)AC Power Supply: 100-240V AC 5%, 50/60HzDC Power Supply: 12V DCPackage List:1 x GSM Dialer2 x Antenna1 x Telephone Wire1 x Terminal1 x Power Adapter1 x ManualNote:Cannot be used for POS access, faxing, cordless phones (there will be cases where incoming calls do not ring or there is no caller ID).