1.The bulb fits 2D or 2C batteries maglite. 2.High lumen output 286lumen at 3v. 3.LED never burns out. 4.Extends battery life to 3 times longer than incandescent. 5.Ultra focus for long distances. 6.Environmental-friendly. 7.Constant current. 8.Non polarity. 9.Good wholesale price for distributors. 10.Package include: 1x led bulb