GSM Door Gate Opener Remote On/Off Relay Switch Remote Control Door Access Wireless Door Opener By Free Call SMS Command

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 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 conservation, 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
12.App Name: Callny control