This Large Neon Clock is 18 in diameter. The clock is a Metal housing unlike the cheap plastic ones you see out there. And takes a AA battery. What makes this neon clock special is it has 2 neons in it. An innner neon and an outer rim neon, The outer Neon is Red and the Inner is white. The photo below is hard to see the 2 neons 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. These clocks have matel housing not like the plastic clocks you see all over the internet. 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.