Features:1) Replace batteries every 100 hours for maximum brightness 2) Portable, and has no wires - can be used anywhere 3) Unique 3M adhesive is reusable over and over again and can withstand extreme temperatures (0 - 150癋) 4) Diameter is 2 5/8", 7/8" in depth 5) Includes 3 x AAA batteries 6) Push on the centre to turn on and off producing area:China