Features 1, x Increased antenna control, more stable signal, security precautions no longer dropped. 2, x 850/900/1800/1900MHz quad bands, can work in the worldwide GSM networks. 3, x No call charges. The GSM Relay Switch answers the call from authorized number then carries out the turn ON/OFF action on the first /u0027ring/u0027. Specifications Overview: This GSM gate opener features remote on/off switch by authorized phone free calls, which can be operated from anywhere, no distance limit, very convenient. Features: x Increased antenna control, more stable signal, security precautions no longer dropped. x 850/900/1800/1900MHz quad bands, can work in the worldwide GSM networks. x No call charges. The GSM Relay Switch answers the call from authorized number then carries out the turn ON/OFF action on the first 'ring'. x Secure - Using caller-ID for identification, unknown callers are ignored. x Add or remove users by SMS Text command. x No need to provide a remote control or keys for different users. x Up to 200 authorized phone numbers can be configured at the specified time. x The relay action will return a SMS confirmation to the owner or authorized call in number, this function is editable by user. x The relay close or open time is programmable. x Multiple applications. (Gates, bollards, barriers, garage doors, shutters and access doors or machines). 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: 50Ω SMA Antenna interface Temperature Range: -20-and60°C Humidity Range: Relative humidity 90% Dimensions: Approx. 3.23 x 2.99 x 1.06in / 82 x 76 x 27mm Package Size: Approx. 19.8 x 11.2 x 3cm / 7.79 x 4.40 x 1.18cm Package Weight: Approx. 9.27oz / 263g Package List: 1 x GSM Door Opener 1 x Antenna 1 x User Manual Card Package List 1 x GSM Door Opener 1 x Antenna 1 x User Manual Card