The Streamlight ProTac HL6 Flashlight uses two USB-C rechargeable protected Li-Ion battery packs that can provide up to 5,300 lm for two hours on high. It can also provide 1,500 lm for 3.75 hours on medium and 450 lm for 12.5 hours on low, as well as strobe for 4 hours. It's IPX7 waterproof and has a durable anodized aluminum construction. Its anti-roll head prevents it from rolling, and its rubber sleeve provides increased grip and thermal insulation.