The X1 Button Radio

The X1 Button Radio, launched in 1997, is a real blast from the past: Sinclair's very first product, way back in 1962, was the Micro 6, billed as the world's smallest radio. The Button Radio, by contrast, is billed as... the world's smallest radio. Plus ça change!

It does live up to this claim, though. The radio is the size of a 10p coin, weighs less than half an ounce and fits inside your ear. An aerial is built in, and tuning is performed automatically across a range of FM frequencies (88-108 Mhz).

The X1 is sold only through mail order, and costs £10.