Sinclair Micro FM radio. 

extremely rar. B-)

Announced in October 1965 at £5.19.6 the Micro FM was a miniature FM radio that was only sold as a kit of parts. It was designed to be used as either a personal FM radio using the included ear piece or more unlikely as an FM tuner for your existing Hi-Fi via an additional ‘audio out’ socket. It lasted as a product until 1967, in which time it had even had the distinction of being ‘copied’ in the far east.

Includes earpiece and detachable telescopic aerial. 
Originally used PP5 9v batteries which are no longer available today.