Features: 1.REMOTE SWITCH: GSM gate opener with remote switch for making free authorized calls that can be operated from anywhere with no distance limitation. 850/900/1800/1900MHz quad band for global GSM network. 2.SMS SMART ALARM: GSM mobile phone access controller with built in 2 way digital input, when any trigger, it will send a reminder message to the designated number, the whole family is aware of it, and start the alarm immediately to protect your assets through GSM network. 3.MULTI USER SUPPORT: GSM door opener supports 999 number groups. Each group of numbers can be set to control relays for a specified period of time. 4.METAL HOUSING: GSM door opener has a metal housing with IP30 protection rating. The metal housing and the system are safely isolated and are especially suitable for industrial control applications. Small size, supports wall mounting. 5.APPLICABLE: For group type doors, elevators, garages, parking lots, 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 Model: RTU5035 Material: Metal Rated Voltage: DC 12V 1 A Protocol: GSM PHASE 2/2+ (including Data Service) Wired Area: 2 Card Slot: Nano SIM Card Signal: 2G GSM: 850/900/1800/1900MHz PackageList: 1 x GSMGateOpener 1 x Antenna 1 x WiringPins 1 x InstructionManual