OLIGHT S20R Baton rechargeable XM-L2 550 Lumens LED Flashlight with True Utility TU246 Tele-Pen bundle, type 18650 Li-ion battery, charging base with two EdisonBright CR123A Lithium back-up batteries Thermal management safety program provides overheating protection by dropping high output by 50% after 4.5 minutes of constant on NEW Low-profile side switch featuring a battery power indicator, which glows red when battery runs low; Olight S20R (rechargeable S20) now Includes new Micro-USB charging dock and 18650 2600 mAh rechargeable battery 550 Lumen max output utilizing Cree XLamp XM-L2 Cool white LED with lifespan of 50,000 hours Automatically return to your last brightness level with the built in memory function; Removable two-position pocket clip Bundle include True Utility TU246 Tele-Pen bundle, type 18650 Li-ion battery, charging base with two EdisonBright CR123A Lithium back-up batteries