This is a Mars Signal Light Co. Model S60 110 volt AC Siren! 6" in dia by about 10" long.THIS IS NOT 6 OR 12 VOLT DC SIREN!! Works GREAT. Use as alarm. Great conversation started! Mount it behind your bar ... flip the switch ... you got everybodies attention!!! Just wire to 110V AC power sorce through a switch and you are ready for some fun. Please take a look at my other auctions for addition items. Thank you for your interest, and have a Blessed day.