brand new and high quality.<br> Use SIM300W module with strong signal and good stability;<br> No need for ground wire line investment, easy installation;<br> Comes with timing, billing, and checking functions (for public phones);<br> It has the functions of receiving signal strength display, working status display, and caller ID display;<br> The operation method is the same as that of ordinary telephone landline;<br> Fully automatic IP function (can be preset through the phone);<br> Can be connected to the voice box, anti-theft alarm host, and meal order software on the market;<br> <br> Feature:<br> 1. Adopting 300W communication module, with the best signal, long-term working stability, clear sound, no noise, no dropping when calling, even in remote mountain areas, signal receiving is also very strong.<br> 2. There are large LCD display in Chinese and English, display signal reception intensity, specific for time, call records, call for time, call cost.<br> 3. With the real billing function, alarm function with multiple charging mode, can be used as a public telephone, completely eliminate billing, cost savings.<br> 4. Support all SIM cards that ordinary mobile phones can use.<br> 5. It has the functions of hands-free dialing function, re-dialing function, caller ID display function (can also see the incoming call number), incoming calls, Dialed calls, missed calls.<br> 6. The rate can be set automatically by manual or factory. can research multiple groups of incoming call or dialed call for time, records, call cost<br> 7. The 2 common telephone interfaces can simultaneously connect to 2 ordinary telephones, and the utility model is convenient for connecting two telephones.<br> <br> Specifications:<br> Operation mode: GSM 900MHz/1800MHz dual frequency<br> Max power: 2W<br> Power consumption: static state 25 mA, launched 600 mA<br> Sensitivity: -104 dB<br> Internal voltage: for DC 5V / 1A<br> Environment temperature: 0 ~+40<br> Operating humidity: 45% to 90% (without dew)<br> Atmospheric pressure: 86~106 kPa<br> Environment noise:<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store