The 14.75" Bubble Clock from Snap-on has a classic clock design and phrasing from the 1940's. Constructed with a metal casing, plastic base and acrylic covering, the DC 12V neon tube makes the clock glow and the tube lasts for 10,000 hours. The new clock has a dome shaped cover and dial face with a UL adapter (110V A/C12V DC) that adds flexibility.