Streamlight PT 2AA Ultra-Compact Tactical Flashlight uses C4 LED technology to produce the brightest output in this size class, with two beam levels plus strobe. Anodized-aluminum; IPX7 waterproof to one meter for 30 minutes. 155 lumens, with up to 2 hrs. runtime. Uses two AA alkaline batteries (included). Includes nylon holster. Streamlight's Ten-Tap programming allows users to select among three programs to suit their preference or operating needs: high/strobe/low (the factory default setting); high only; or low/high. Length: 6.14". Weight: 3.4 oz.