Light Source: C4 LED w/A 50,000 hour lifetime. On/Off: Multi-Function, push-button tactical tailswitch. One handed operation of momentary or variable intensity mode. Features: LED solid state power regulation provides maximum light output throughout battery life. IPX7 rated design; waterproof to 1-meter for 30 minutes. Anti-roll face cap. Removable pocket clip. Serialized for positive identification. Dimensions: 4.68" Long x .9" Wide x .77" Diameter. Color: Black.