Streamlight 88061 ProTac 1L-1AA 350-Lumen Dual Fuel Professional Tactical Light, Black

Perfect everyday carry light that accepts a single lithium or alkaline battery, with High/Low/Strobe modes
Powered by one CR123A lithium battery, one AA alkaline or AA lithium batteries
Ultra-bright white LED, impervious to shock, with a 50,000 hour lifetime
Run Time: CR123 Lithium Battery – High 1 hour 30 minutes, Low 14 hours, Strobe 3 hours; AA Alkaline Battery - High 1 hour 20 minutes, Low 7 hours 30 minutes, Strobe 3.5 hours; AA Lithium Battery – High 4 hours 15 minutes, Low 14 hours, Strobe 8 hours
Length: 8-1/2 -Inch