AC 220V 50Hz LED Sound Light Operated Switch Energy Sensor Voice Control Lamp Acoustic Sensor
A part of the review has been auto-translated.
I was a litle bit confused how it works, but after a while I have understand it. - In the room the light was on. - I have installed the sensor and turned the energy on -> the connected light was a part of a second on and then was it switched off - Now I have turned off the room light. - With a clapping in my hands the sensor switsched on the light. - After about 1 minute the light was switsched off by the sensor and was prepar for next noise. All works fine and is suitabel vor many applications.
I bought 3 pieces. Two are very sensitive (too sensitive) but the last one is insufficiently sensitive. It will be difficult to find a good application. But it's not a toy because it works at 220V.