Rechargeable flashlights are typically low power with low run-times. Not the RS11. The ultra bright CREE XM-L U2 LED outputs a maximum of 620 ANSI lumens constantly for 2.2 hours and maximum runtime in low mode is 215 hours. Please note that an 18650 rechargeable battery is NOT included with the light. We recommend this one. The RS11 features Klarus’s patented dual-switch user interface (UI), which gives you full control over the flashlight using just your thumb. This unique UI uses two switches – one high/ prominent switch and one lower switch, both of which are located on the side of the flashlight and are easy to locate by touch in the dark. The position of these switches makes it easy to change modes and instantly access the disorientating strobe, which is an effective personal safety feature. You can take the RS11 everywhere you go because it can be recharged in many different ways – for example: via a mains socket, PC/ laptop USB port, car USB port, 12v plug (with a 12v adapter), USB solar charger…In fact, any device with a USB port. If you are in a remote location with none of the above charging options available, you can use a recharged 18650 battery or even 2x CR123A batteries – making it extremely versatile. The RS11 is packed with features; in addition to the above, the flashlight has a memory function to memorize the last mode used; it has a stainless steel strike bezel that can be removed and replaced with a color filter or diffuser; and the charging cable connector is magnetic, so it is quick and easy to insert the charger plug. Add to this the precision engineering, tough construction and thoughtful design, and you can see why the Klarus RS11 is an excellent choice for police, security, search & rescue, outdoor pursuits, traveling, home use and personal protection. Features: Specially designed magnetic connection. When the charging cable is within 1cm of the charging port it self-locates to make the connection. The charging cable can be removed quickly and safely at any time, which makes it an effective flashlight to use in rapid response situations. Ergonomically designed to be easy to operate with just one hand. The switches are very easy to locate by touch in the dark. Uses a USB interface chargeable design, so you can charge in the home, office, airport, vehicle, etc. Basically, anywhere that has a USB interface. You can also remove the battery and charge separately and also use CR123A batteries (do not charge CR123A batteries). Low loss, high intensity, portable USB charging cable (K1-D5) Any 18650 rechargeable battery with PCB protection can be used. Strobe can be activated when the flashlight is on or off, giving instant access to a blinding strobe from any mode. Three lighting modes with memory function make it adaptable for different situations. Detachable stainless steel strike bezel protects the lens and has a self-defense purpose. Color filters and a diffuser can be securely attached; screwed-in to replace the bezel Uses just one 18650 battery. Max output is 620 ANSI lumens and super long runtime of 9 days. Waterproof to IPX-8 Standard (underwater to 2 meters) Specification: CREE XM-L (U2) LED with a lifespan of up to 50,000 hours Lighting modes: 620 ANSI lumens (2.2 hrs) -- 150 lumens (7.3 hrs) -- 10 lumens (215 hrs) Variable frequency strobe: 620 lumens (4.4 hrs) Working Voltage: 3.4V - 8.