Overview: This GSM gate opener features remote on/off control via authorized phone calls, enabling operation from any location without distance limitations. Features: * Enhanced antenna design for improved signal stability and reliable performance. * Quad-band 850/900/1800/1900MHz support for compatibility with global GSM networks. * No call charges required. The GSM relay switch answers incoming calls from authorized numbers and activates the on/off function upon the first ring. * Secure caller ID authentication; unauthorized callers are automatically ignored. * Add or remove authorized users via SMS commands. * No need to distribute physical remote controls or keys. * Supports up to 200 authorized phone numbers with scheduled access settings. * Relay operation can send SMS confirmation to the owner or authorized number; this feature is user-configurable. * Programmable relay on and off timing. * Suitable for various applications including gates, barriers, garage doors, shutters, bollards, and access control systems. Specifications: GSM Frequency: 850/900/1800/1900MHz Digital Output: NC/NO dry contact, 3A 240VAC/DC Power Supply: 9–24V DC, 2A Power Consumption: 12V input, max 50mA, average 25mA SIM Card: Standard SIM card Antenna: 50 Ohm SMA connector Temperature Range: -20°C to +60°C Humidity Range: Up to 90% relative humidity Dimensions: Approx. 3.23 x 2.99 x 1.06 in (82 x 76 x 27mm) Package Size: Approx. 7.79 x 4.40 x 1.18 in (19.8 x 11.2 x 3cm) Package Weight: Approx. 9.27 oz (263g) Package List: 1 x GSM Door Opener 1 x Antenna 1 x User Manual Card