Features: 1. Free call charges. 4GLTE door opener will reject calls from authorized numbers and perform the door opening/closing operation on the first ring; 2. No longer the traditional way to open the door, shaking the door to open is more interesting; 3. Multiple applications (gates, bollards, barriers, garage doors, rolling doors and access doors or machines); 4. Security - use caller ID for identification, unknown calls will be ignored; no need to provide remote controls for different users; 5. Can be operated anywhere, without distance restrictions; add or delete users via SMS; Specifications: Rated voltage: 12VDC 1 A Operating temperature: -10~+60 Storage temperature: -20~+60 Relative humidity: 10-90%, non-condensing 4GLTE frequency: B1 B3 B5 B8 Output relay related voltage: 6A/240V AC Up to 999 authorized phone numbers can be configured; Two digital inputs for door sensors, motion sensors or other sensors to protect your doors and windows. When any of them is triggered, an SMS alert message will be sent and the siren will be activated immediately; One relay rated 6A/240VAC Output for connecting a door or machine switch; relay action will return a text message confirmation to the owner, and this function can be edited by the user; based on the 4GLTE network, it is suitable for many applications. Material: Metal Color: Blue Package Contents: 1 x GSM door opener The above package contents only, not including other products.