Suitable for Alarm System! Compatible with GSM 850/900/1800/1900 MHz widely used with many providers</br>With two communication portals you can connect your desktop phone with our terminal</br>You can dial the local calls domestic and international calls with this terminal connecting with a desktop phone and a SIM card</br>Call ID display time and date display the power supply situation of battery can be displayed at the same time on the LCD</br>Simple to install and easy to maintain A directional higher gain antenna can be connected to solve the poor coverage problem</br></br>Product Description</br></br><b>Connecting your service provider</b><br> To use the networks services available in your terminal you will need to sign <br>up with a wireless provider and purchase a SIM (subscriber identity module) <br>Card or purchase a prepaid SIM card. In many cases the wireless provider will <br>make available descriptions of its services and instructions for using its feature. <br>Wireless provider may differ in their support of feature. Before you sign up make<br> sure a wireless provider suppore the features that you need.<br><br> <b>Specifications:</b><br>Compatible to PABX?? alarm syst