Features: 1. No call charges. The 4G LTE Gate Opener detects a call from an authorized number and performs the ON/OFF action upon the first ring; 2. Modern door control method allows operation by simple vibration or motion activation; 3. Multiple applications including gates, bollards, barriers, garage doors, shutters, access doors, and machines; 4. Secure operation using caller ID for identification; unknown callers are automatically ignored; no need to distribute remote controls; 5. Operable from any location with no distance limitation; add or remove users via SMS; Specification: Rated Voltage: 12VDC 1 A Working 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 voltage rating: 6A/240V AC Supports up to 999 authorized phone numbers; Two digital inputs for door sensors, motion sensors, or other sensing devices to monitor doors and windows; when triggered, sends an SMS alert and activates the siren; One relay output (6A/240VAC) for connecting to door switches or machine controls; Relay activation can send SMS confirmation to the owner; this feature is user-configurable; Designed for 4G LTE network connectivity, suitable for various automation applications; Material: Metal Color: Blue Package Contents: 1 x GSM Gate Opener Note: Light reflection and display settings may cause slight color variations between the image and the actual item. Measurement tolerance: +/- 1-3 cm.