This is a fabulous tool which can assist with vocalisation and cause and effect learning. Other competitors will lead you to buy a whole "sound" panel or a fixed unit costing hundreds, if not thousands of £'s. The Sound Switch by Mike Ayres Design can turn any piece of equipment into Sound activated, interactive product in a flexible, mobile and ergonomic package.
This highly sensitive and controllable switch can pick up any sound using its internal microphone or via an external microphone plugged into it. Sensitivity can be adjusted to make it respond to a whisper through to a loud shout or noise. When activated it will switch a mains or low voltage controller in whatever mode it is in.
For sound switch and microphone see product 0765-031.