You are bidding on a Whelen model 7006205 14-28 volt single head aviation strobe power supply. This unit has been tested good and is guaranteed not DOA. Use for wing tip, tail, belly, or anywhere a single strobe would be installed. This is a "comet flash" unit, 4 quick flashes per cycle. Also has sync connection for syncronizing up to 5 units. Can be found on Cirrus aircraft, but can be used on many types.