The 500 Lumen Streamlight ProTac 2L-X USB LED Flashlight is an EDC light that is available two ways: The ProTac 2L-X USB is a complete rechargeable system that includes their new 18650 USB battery with an integrated USB charge port and features 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 Rechargeable system includes 18650 USB lithium ion battery and USB cord and nylon holster Non-rechargeable system includes two CR123A lithium batteries and nylon holster TEN-TAP Programming - Choice of three user selectable programs: 1) high/strobe/low 2) high only 3) low/high High LED output for maximum illumination: 500 lumens; 165m beam; runs 2.75 hours (CR123A batteries); runs 3.25 hours (18650 USB battery); 6,800 candela Low LED output for extended run time: 40 lumens; 49m beam; runs 30 hours (either battery type); 600 candela Strobe for signaling or disorienting: runs 3.25-4.5 hours; runs 3.25 hours (18650 battery) Durable, anodized aluminum construction; removable pocket clip IPX7 waterproof to 1m for 30 minutes, 2m impact resistance tested Anti-roll head Includes nylon holster 5.14" (13.0 cm); 3.9 oz (111g) with CR123 batteries; 4.4 oz (125g) with 18650 USB rechargeable batte RoHS compliant