This magnetic light is great for hands-free lighting. Because it's magnetic, it holds to the barrel and lights up the interior, so you can work with both hands and get a great view of your cleaning progress. LED puts out 15,000 MCD of bright white light from three LR44 button cell batteries (included). Eight-hour run time. Magnetic Bore Light:Machined aluminum barrelHigh strength rare earth magnet5 flex-neck positions light hard to reach areas15,000 MCD brightnessPush button on/off switchUses 3 LR44 button cell batteries (included)8-hour run time