1Built-in 3G module, compatible with GSM version. With remote switch function, free call through authorized phone, can be operated from any place, there is no distance limit, and up to 1000 authorized phone numbers can be configured within a specified time. 2High security, use caller ID for identification, unknown callers will be ignored. Builtin rechargeable battery for power failure alarm. 3You can add or delete users through SMS text commands. There is no need to provide remote controls or keys for different users. A wide range of applications, including doors, bollards, fences, garage doors, shutters, and doors or machines. 4The relay switch will return the SMS confirmation to the owner in the number or authorize the call. This function can be edited by the user. The switching time of the relay is programmable. 5There are no phone charges. After receiving a call from an authorized number, the GSM trunk switch will turn on/off the first "ring". Item Type: GateOpener Material: ABS Plastic Model: RTU5024 Digital Output: NC/no dry contact, 3A/240VAC DC Power Supply: 9-15VDC/2A Power Consumption: 12V input maximum 50mA / Average 25mA SIM Card: Standard SIM card Antenna: 50 SMA antenna interface Temperature Range: -20- 60C Humidity Range: 90% RH Battery Capacity: 1000mAh (Built-in) Size: Approx. 3.23x2.99x1.06in / 82x76x27mm 1 x 3G/GSMGateOpener 1 x Antenna 1 x USB Data Cable 1 x USB Programming Cable 1 x User Manual Please distinguish the corresponding frequency before placing an order:European frequency: UMTS:900/2100MHz, GSM/EDGE: 900/1800MHzAmericas frequency: UMTS:850/1900MHz, GSM/EDGE: 850/900/1800/1900MHzAustralia frequency: UMTS:850/2100MHz, GSM/EDGE: 850/900/1800/1900MHz