1、[Call Remote Control] You can make free phone calls through your mobile phone to remotely access the gate or garage door! True authorization protecting, unknown caller will be ignored. 2、[Multi Functions] Supports free call remote control, SMS control, APP control. Supports for callny control APP for adding 1001 authorized users. Supports one key query of all users. Support remote restart and reset, no distance restrictions, can be operated anytime, anywhere. 3、[GSM 2G Frequency] Supports continuous relay with no time limit. The delay closing time of the relay supports 0‑9999s. Adopting GSM 2G frequency, can be used in global GSM networks. 4、[Multiple Applications] This remote switch is suitable for doors, elevators, garages, parking lots, resorts, control rooms, warehouses, group unmanned machine rooms and more. 5、[ABS Material] This gate opener is made of ABS material, with excellent insulation, suitable for industrial control applications. Small size and support wall mounted installation.