The Nitecore MH27UV has a maximum output of 1000 lumens from the Cree XP-L HI V3 and is powered by either 1 x 18650 Li-ion, rechargeable battery or 2 x CR123 single use batteries. Boasting four brightness levels plus a red and blue LED, the most noteable function of the torch is a 500mW 365nm ultraviolet LED that is ideal for petrol inspection, mine exploitation and forensic sceience. The UV is preferable for experts in geomological appraisal, document examination and currency detection. As with the MH27, the UV version utilises the same Cree XP-L HI V3 LED which casts a powerful beam, capable of reaching across great distances at double the intensity. The torch is rechargeable, making it convenient for use, storage and charging as the 18650 battery can be charged inside the torch using the included Micro USB cable. This means an external charger is not required, which makes for lighter, easier use. Brightness Levels: (using 1 x Nitecore 18650 3400mAh) Turbo: 1000 lumens - 1 hr runtime High: 250 lumens - 6 hrs 15 mins runtime Mid: 55 lumens - 28 hrs runtime Low: 1 lumen - 708 hrs runtime Red LED: 13 lumens - 28 hrs runtime Blue LED: 3 lumens - 18 hrs runtime UV: 28 hrs runtime (using 2 x CR123 batteries) Turbo: 1000 lumens - 45 mins runtime High: 250 lumens - 4 hrs 45 mins runtime Mid: 55 lumens - 20 hrs runtime Low: 1 lumen - 505 hrs runtime Red LED: 13 lumens - 19 hrs runtime Blue LED: 3 lumens - 19 hrs runtime UV: 19 hrs runtime Plus Location Beacon, Red/Blue Warning Light, SOS & Strobe. Maximum beam distance 462 meters, waterproof to IPX-8 (2 meters submersible) and resistant to impacts up to 1.5 meters. The RSW1 remote pressure switch fits this torch. Includes: holster, micro USB charging cable, wrist lanyard, pocket clip, spare o-rings, spare USB cover, spare tail switch cover