1、*850/900/1800/1900MHz quad bands, can work in the worldwide GSM networks. 2、*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. 3、*Secure - Using caller-ID for identification, unknown callers are ignored. 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: *850/900/1800/1900MHz quad bands, can work in the worldwide GSM networks. *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'. *Secure - Using caller-ID for identification, unknown callers are ignored. *Add or remove users by SMS Text command. *No need to provide a remote control or keys for different users. *Up to 200 authorized phone numbers can be configured at the specified time. *The relay action will return a SMS confirmation to the owner or authorized call in number, this function is editable by user. *The relay close or open time is programmable. *Multiple applications. (Gates, bollards, barriers, garage doors, shutters and access doors or machines). Specifications: Model: 5034 GSM Frequency: 850/900/1800/1900MHz Supports: 2G/3G/4G GSM Card 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~+60°C Humidity Range: Relative humidity 90% Dimensions: Approx. 3.86 * 3.54 * 1.02in / 98 * 90 * 26mm Package Information: Package Size: Approx. 5.12 * 3.74 * 1.18in / 130 * 95 * 30mm Package Weight: Approx. 4.87oz / 138g Package List: 1 * GSM Door Opener 1 * User Manual 1 * Autenna 1 * GSM Door Opener 1 * User Manual 1 * Autenna