Streamlight PolyTac X USB Mid Size Flashlight - The 600 lumen PolyTac X is available two ways: The PolyTac X USB is a complete rechargeable system that includes our new 18650 USB battery with an integrated USB charge port. The PolyTac X includes two CR123A lithium batteries. Both feature MULTI-FUEL innovation that allows them to accept Streamlight's 18650 USB battery or CR123A lithium batteries, ensuring you'll always have a beam when you need it. Multi-fuel - Uses rechargeable 18650 USB battery or two CR123A lithium batteries 1) high/strobe/low 2) high only 3) lowithmedium/high Removable, multi-position pocket clip High-impact, super-tough nylon polymer with Rocky Stipple texture for a sure grip IPX7, waterproof to 1m for 30 minutes, 3m impact resistance tested 4.34 oz. (123 grams) Length: 5.46 inch (13.87 cm)