TerraLux's Newest upgrade for Streamlight Stinger! 220 Lumen Cree Q4 LED Electronic Regulation Extends Battery Runtime Extends Battery Lifetime Saves Money Brighter than Incandescent Bulb Complete Upgrade Kit includes new head lens and LED module Heavy Duty Heat Sink 2 hour runtime High-Qualtiy TIR lens focusable Fits Steamlight Stinger and Stinger XT with 3.6V rechargeable batteries only