Bright, long-running, and packed with features useful to public safety and military professionals, the Nitecore P10i Rechargeable Tactical LED Flashlight is an everyday-carry powerhouse. The light's Luminus SST-40-W LED emits up to 1800 lumens, and the low-power setting of 35 lumens will run as long as 50 hours on a fresh charge. The high-capacity 4000mAh 21700 Li-ion battery charges inside the light through a moisture-protected USB Type-C port, and a side-mounted LED shows the battery's remaining power level. Accommodating tactical grips, the light is fully controlled from dual tail switches—a raised push button for on/off on a momentary or constant-on basis, and a mode switch for selecting high, medium, low, or strobe modes. On any setting or when the light is off, you have instant access to the strobe with a long press of the mode switch.The light's reflector is engineered with crystal coating and precision digital optics technologies for a long throw. Its crenellated bezel can be used as a window-breaker or for tactical purposes. Built for durability, the light features an aluminum housing with a Type III hard-anodized black finish, an anti-roll ring, and diamond-pattern knurling for a good grip. Advanced Temperature Control circuitry guards against overheating. O-ring sealed and IPX8-rated, the light is submersible to 6.6', and impact-resistant to 5 feet.