Streamlight 88854 PolyTac LED Helmet Lightning Kit, Yellow - 275 Lumens Includes PolyTac LED flashlight, lithium batteries, Streamlight Helmet Mount and Rubber Helmet Strap Flashlight case made from high impact, super tough nylon polymer for exceptional durability and a sure grip Borofloat glass lens, o-ring sealed C4 LED technology, impervious to shock with a 50,000 hour lifetime Tailcap push button provides one handed momentary or constant on operation