This Large Neon Clock is 18 in diameter. The clock housing is all Metal and takes a AA battery. What makes this neon clock special is it has 2 neons in it. An innner neon which is whte to illuminate the artwork and an outer rim neon which is yellow, the photo below is hard to see the 2 neons do to glare but this truly is an awesome neon clock, unlike the other cheap clocks on the market, this is the top of the line and you get an inner and outer neon tubing with this clock. The clock also needs to be plugged in to the wall for the neon transformer to be powered. UPS will not deliver to a P. Box or Military Addresses.