Specifications:

Operating Voltage: 4.5-5V

PCB Size: 4.9x2.7cm/1.93x1.06inch

Clap Sound control range : around 4m 

The device is driven by a programmed micro-controller that detects loud noises. The on board microphone picks up on these noises (claps). When a single clap is detected, a countdown begins, and the device waits for another clap. If another clap is detected within a short period after the first clap, then the relay will turn on, and stay on until another two claps are detected.

Package Included:

1 x DIY Clap Acoustic Control Switch Module Suite Circuit Electronic PCB Kit

schematic & instructions not included - please see pic above.