The c-gate is a cellular gate opener which you connects to the gate and it turns your cell phones to a remote control letting you open the gate trough your cell phone without paying any cost for the call as it uses caller-ID technology to open the gate Features - Supports up to 1200 users - High level of security - Remote administration PC-based and SMS-based - Lists of users can be seamlessly imported from microsoft excel - GSM-based - Small dimensions - Plug-and-Play - Integrated alert system Specifications - GSM band 900 / 1800 MHz. - RS232 D-type 9 pin connector. - Rigid aluminum case.