Features: 1. No call charges. The 4GLTE Gate Opener rejects the call from authorized number then carries out the turn ON/OFF action on the first 'ring; 2. It is no longer traditional to open the door, but it is more interesting to open the door by shaking it. 3. Multiple applications. (gates, bollards, barriers, garage doors, shutters and access doors or machines); 4. Secure - Using caller ID for identification, unknown callers are ignored; No need to provide a remote control for different users; 5. Can be operated from anywhere, no distance limit; Add or remove users by SMS Text command; Specification: Rated Voltage: 12VDC 1 A Working temperature: -10℃~+60℃ Storage temperature: -20℃~+60℃ Relative humidity: 10-90%, No condensation 4GLTE frequency: B1 B3 B5 B8 Related Voltage of the Output Relay: 6A/240V AC Up to 999 authorized phone numbers can be configured; Two Digital inputs for door sensor, motion sensors or other sensors to protect your door and windows, when any one of them triggered, will send SMS alert message and start the siren immediately; One output with relay rating 6A/240VAC for connecting the switch of the door or machines; The relay action will return a SMS confirmation to the owner, this function is editable by user; Based on 4GLTE Network, applied to many applications. Material: Metal colour: blue Package Contents: 3 x Gsm Gate Opener