Features:

1. No telephone charges. The device rejects the phone from the authorized number, and then turns on / off on the first “ring tone”. 2. Opening the door is no longer traditional. Shaking the door adds more fun. 3. Multiple applications. (doors, door posts, guardrails, garage doors, shutters and access doors or machines). 4. Security – use caller ID for identification, and unknown callers will be ignored. 5. It can be operated from any place without distance limit 6. Add or delete users through SMS text command.

Rated voltage: 12V DC 1A Operating temperature: – 10 ℃ ~ 60 ℃ Storage temperature: – 20 ℃ ~ 60 ℃ Operating frequency: 900 / 1800 MHz