littleBits Electronics Sound Trigger

This is one individual littleBits bit:

The sound trigger listens to the noise level in your room, and sends an ON signal when it gets over a certain level. You can make that threshold louder or softer using the included screwdriver. We like to use it with an LED to light up your room when you snap your fingers.

What's littleBits? littleBits is an opensource library of electronic modules that snap together with magnets for prototyping, learning and fun.