OP24 series Exit Button is no-touch infrared exit button with Tuya smart APP. 

It's very stable and sensitive,with automatic adaptability to ambient temperature and humidity,do not affect by the weather or temperature. 

Output the NO or NC signal when recognize the gesture .

The indicator light is red when it's in standby, and the indicator light is green when the signal is recognized.

More details, You might check below web link: https://www.s4a.com.cn/list/?249_1.html、