This Light Sensitive Sound Box should probably be sub-titled ‘how to get your head smacked’. Hide the box in someone’s bedroom, and watch or listen as the device emits either a dog bark or dripping tap noise when they switch the light off. Yeah well, an Einstein product it ain’t. The annoying thing of course is the fact that the noise stops when they turn on the light to hunt for the source, making it difficult to locate without a good flashlight. OK, childish, we’ll stop now. £4.99.