This sound switch module will switch a light load on at a loud sound, especially higher frequencies, like breaking glass or clapping your hands. Remove the power (3..5 Volt) to turn the switch off again. Consists of a PCB (50 x 50 mm) with a microphone, transistor, SCR, a potmeter to set the sensitivity and a few other components. Hookup information is available.
This is a surplus product. It was obtained from a surplus store, from an inventory or from any other secondary source. You can expect this product to be in good working condition, but it can show signs of being handled, shipped, repackaged etc. The supply of a surplus article can suddenly run out, or the price can change. Get it while it is available.