Features: 1.REMOTE CONTROL: Smart garage door controller with remote switch, easy APP control operation, for making free authorized calls, can be operated from anywhere, no distance limitation, can be used for global network. 2.SIM CARD SUPPORT: No call charges, relay switch receives calls from authorized numbers and then performs the switch operation on the first "ring". Supports standard SIM cards only. 3.AUTOMATIC IDENTIFICATION: Use 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. 4.PROGRAMMABLE: Add or remove users with SMS text commands. Relay or open time is programmable. Relay operation returns SMS confirmation to or authorized phone, this feature can be passed with no call charges. 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: RTU5024 4G Material: Metal Card Slot: Standard SIM Card Network: 2G, 3G, 4G Frequency: GSM: B3, B5, B8 (1800, 850, 900) CDMA: BCO (800MHZ) WCDMA: B1, B5, B82100, 850, 900 DD: B1, B3, B5, B7, B8, B20 (2100, 1800, 850, 2600, 900, 800) TDD: B38, B39, B40, B41 (2600, 1900, 2300, 2500) DC Power Supply: 9?24V Antenna: 50 SMA PackageList: 1 x GSMGateOpener 1 x Antenna 2 x Wiring Terminal 1 x Instruction Manual NotePlease note that the product is only supported in Europe, Africa and Asia.