Streamlight's PT series of flashlights are ultra-compact, lightweight tactical personal lighting tools with up to 180 lumens and 50 hours of runtime. They feature a strobe setting and a high and low intensity setting. The C4 LED has a 50,000-hour lifetime. The lights require either CR123A lithium batteries (Nos. PT 1L and PT 2L) or AA alkaline batteries (Nos. PT 1AA and PT 2AA). All batteries are included.