Welcome to our store! 1. REMOTE CONTROL: Smart garage door controller with remote switch, easy APP control, for making free authorized calls, can be controlled anywhere, no distance limitation, can be used for global networks. 2. SIM CARD SUPPORT: No call charges, the relay switch receives calls from authorized numbers and then performs the switching operation on the first \"signal\". Only supports standard SIM cards. 3. AUTOMATIC IDENTIFICATION: Use caller ID to identify and ignore unknown callers. Add or remove users with SMS commands. No need to provide remote controls or keys for different users. 4. PROGRAMMABLE: Add or remove users with SMS commands. Relay or opening time is programmable. Relay operation returns SMS confirmation to an authorized phone, this function can be sent without call charges. 5. ALLOWED: For group types of doors, elevators, garages, parking lots, facilities, control rooms, warehouses, unattended machine rooms and other telecom operators, on-site lighting subframes, on-site base stations, traffic controllers and power distribution systems as well as on-site cabinets. Product Type: GSMGateOpener 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, B8 (2100, 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: 50Ω SMA 1 x GSMGateOpener 1 x Antenna 2 x Cable Terminal 1 x User Manual Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best possible customer service.