This website details the design and construction Wave Bubble: a self-tuning, wide-bandwidth portable RF jammer. The device is lightweight and small for easy camouflaging: it is the size of a pack of cigarettes.
Introducing the sandpit digger. Made from solid pine and steel bolts, this sandpit digger is suitable for ages 2 - adult! As well as being amazing fun in the sandpit or garden, this sturdy piece of functional machinery helps children develop hand-eye