Features: 1. Free call charges. 4G LTE door opener will reject calls from unauthorized numbers and perform the door opening/closing operation on the first ring. 2. Modern method of door control eliminates physical shaking; offers a convenient alternative to traditional access methods. 3. Suitable for multiple applications including gates, bollards, barriers, garage doors, rolling doors, and access doors or machines. 4. Enhanced security through caller ID verification; unknown calls are automatically ignored. No need for remote controls for different users. 5. Remote operation possible from any location without distance limitations. Add or remove authorized users via SMS commands. Specifications: - Rated voltage: 12V DC, 1 A - Operating temperature: -10°C to +60°C - Storage temperature: -20°C to +60°C - Relative humidity: 10–90%, non-condensing - 4G LTE frequency bands: B1, B3, B5, B8 - Output relay rating: 6A / 240V AC - Supports up to 999 authorized phone numbers - Two digital inputs for connecting door sensors, motion sensors, or other detection devices to monitor doors and windows. When triggered, an SMS alert is sent and siren activates immediately. - One relay output (6A / 240V AC) for connection to door or machine switch. Relay activation sends a text message confirmation to the owner; this feature is user-configurable. - Operates on 4G LTE network for reliable connectivity across various applications. Material: Metal Color: Blue Package Contents: 1 x GSM Door Opener (Note: Package includes only the items listed above; other accessories are not included.)