Designed to work in both 20 and 40 light sets which take push in bulbs with a single "peg" fixing.

These units will NOT work with lights which have bulbs with a notched base.

New Old Stock on original unopened cards.  

Cards are in a very scruffy condition from storage. Flasher units are intact.

Units take a little time to warm up before set lights up and begins to flash.

Simple to fit - remove one bulb from the set and replace with the flasher unit.

Price includes UK postage

Thank you for your interest