Streamlight's PT series of flashlights - PT 1L, PT 2L, PT 1AA and PT 2AA - are ultra-compact, lightweight tactical personal lighting tools with up to 180 lumens and 50 hours of runtime. Featuring durable anodized aluminum construction, each of the models offers a high and low intensity setting, as well as a strobe function, along with a convenient push-button tail switch for easy, one-handed operation, The flashlights require either CR123A lithium or AA alkaline batteries. All batteries are included.