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 ; 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 , when any one of them triggered, 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 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: 1 x Gsm Gate Opener Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.