Features: 1.Remote On Off Switch: GSM gate opener with remote on or off switch, easy APP control operation for free authorized calls, can be operated from anywhere with no distance limitation. 2.GSM Frequency: GSM remote control gate opener supports 850, 900, 1800, 1900MHz quad bands for worldwide GSM network. Made of premium metal material for durability. 3.No Call Charges: RTU5024 access controller receives calls from authorized numbers and then performs an on or off operation on the first "ring". Supports standard 2G SIM cards only. 4.Smart Identification: GSM remote control switch uses Caller ID to identify and ignore unknown callers. Add or remove users using SMS text commands. No need to provide remote controls or buttons for different users. 5.Suitable For: RTU5024 remote controller is suitable for grouped type of doors, elevators, garages, resorts, control rooms, warehouses, unsupervised machine rooms and other telecom operators, on site lighting subframes, on site base stations, traffic controllers and distribution electrical systems and on site cabinets. specification:Item Type: GSM Gate Opener Material: Metal Model: RTU5024 Card Slot: Standard SIM Card Network: 2G GSM Frequency: Frequency Band 850 900 1800 1900MHz DC Power Supply: 9-24V Antenna: 50 SMA PackageList: 1 x GSM Gate Opener 1 x Antenna 2 x Wiring Terminal 1 x Instruction Manual