Features: 1. No call charges. The 4GLTE gate opener rejects the call from an authorized number and then performs the 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 - Uses caller ID for identification, unknown callers are ignored; No need to provide a remote control for different users; 5. Can be used anywhere, no distance limit; Add or remove users via 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 windows, when any of them are triggered, an SMS alert message will be sent and the siren will start immediately; One output with relay rating 6A/240VAC for connecting the door or machines' power switch; The relay action returns an SMS confirmation to the owner, this function can be edited by the user; Based on 4GLTE network, applied to many applications. Material: Metal color: 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 allowed measurement error is +/- 1-3 cm.