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: 1. Support global 2G 3G 4G communication frequency 2. Support authorized 1001 user numbers. Support to query the number authorized by yourself 3. Support 9-36V wide voltage input 4. Support relay delay closing time 0-999 seconds 5. Support the relay to be permanently closed until the next command interrupts the closure 6. Authorization protection, support whitelist and blacklist 7. Support remote restart, remote reset 8. Support one-click query of all numbers 9. Support query device status 10. Support query signal value 11. Support authorized number to call in and SMS to control the device Specifications: Model: G203 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~+60C Humidity Range: Relative humidity 90% APP: callny control Item Size: Approx. 10.3 * 5 * 3.1cm / 4.1 * 2 * 1.2in Package Information: Package Size: Approx. 11.5*6.3*4cm / 4.5*2.5*1.6cm Package Weight: Approx. 97g / 3.4oz Package List: 1 * GSM Door Opener 1 * User Manual Card