Diameter: 13cm (not quite 5 -1/4")
Uses: 4 AA batteries (not included)
Bulbs: 23 LED lights (20 on the outside, 3 on the inside)
Modes: 2 modes; 3 LED power (low) or 23 LED power (high)
Additional Features: Extra carabiner for convenient usage,
Portable and easy to mount, water resistant, LED's minimum of 50,000 hours of use! There is a strong hold magnet on the back side also which help hold it in place if mounted underneath of another magnetic object!