Overview: This GSM gate opener features remote on/off switching via authorized phone calls, operable from anywhere with no distance limitations, offering high convenience. Features: * Enhanced antenna control for more stable signal transmission and improved security without signal drops. * Quad-band 850/900/1800/1900MHz support for worldwide GSM network compatibility. * No call charges. The GSM relay switch answers incoming calls from authorized numbers and executes ON/OFF actions upon the first ring. * Secure operation using caller ID verification; unknown callers are automatically ignored. * Add or remove authorized users via SMS text commands. * Eliminates the need for physical remote controls or keys for multiple users. * Supports up to 200 authorized phone numbers with configurable access times. * Relay action can send SMS confirmation to the owner or authorized number; this feature is user-configurable. * Programmable relay on/off timing. * Suitable for multiple applications including gates, bollards, barriers, garage doors, shutters, access doors, and machinery. 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 SMA Antenna interface 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 27 mm Package Size: Approx. 7.79 x 4.40 x 1.18 in / 19.8 x 11.2 x 3 cm Package Weight: Approx. 9.27 oz / 263 g Package List: 1 x GSM Door Opener 1 x Antenna 1 x User Manual Card