Streamlight KeyMate Flashlight Jetscream Whistle, DVD #72009 Virtually unbreakable machined aircraft aluminum; Rotating On/Off Head Switch Lens: Unbreakable polycarbonate with scratch-resistant coating; Reflector optics deliver up to 400% more lighting range than traditional penlights 100,000 hour lifetime high intensity LEDs with reflector options; LED available in white, blue, or green Up to 96 hours run time on four alkaline battery cells (either LR44, AG13, LR1154, or A76) 2-1/4-inches long