UV LED flashlight E21, Installing the Batteries Hold the aluminium casing firmly in one hand and turn the end cap in a counter-clockwise direction until fully unscrewed. Pull the end cap away from the casing and this will reveal the battery cartridge. Place each battery in turn within the cartridge ensuring that the polarity marks (+ and -) on the battery match that of the cartridge. With all batteries installed replace the cartridge into the casing and turn the end cap in a clockwise direction until fully tightened. The flashlight is now ready to be used. IMPORTANT: Please ensure that the batteries are installed correctly otherwise battery damage may occur, possibly resulting in an explosion. Never try to recharge batteries or use new and used batteries together. Always change all the batteries at the same time and only use high quality ones of the same type and brand. Be careful not to touch the gold contacts on the end of the battery cartridge or rest them against anything conductive as this could cause a short circuit. If you do not intend to use the flashlight for a long period of time, remove the batteries to prevent them leaking and damaging the flashlight. NOTE: When the batteries have been depleted after continuous use of the flashlight, it is possible to use it once again if left for 8 hours to recover. This will enable further use until the batteries have been completely depleted. Useful in emergency situations or in simply getting the most from your batteries. 2, Operating the Flashlight To switch on the flashlight simply press the end cap switch until it engages, then release. To switch the flashlight off, press the end cap switch once again until it disengages, then release. 3, Ultraviolet Light Function This flashlight produces ultraviolet light that reacts with phosphorus in certain organic substances, illuminating fluorescent molecules. This makes it ideal for cash (currency) detection, credit card, automobile air condition fluid leaking (freon) detection, glass break detection, mineral hunting, petroleum jelly, blood residue, urine, saliva and semen. The UV light can also be used as an accelerator for shadowless glue and UV-curing adhesives. 4, Tactical Crenulated Bezel Although not designed to replace a professional life saving hammer, in an emergency the flashlight can be used to break glass. For best results use strong physical force and angle the flashlight correctly. The crenulated bezel also allows the flashlight to be used for self defence purposes.5, Warning 1, The light from this flashlight is very powerful and should not be shone directly into anyone’s eyes, as this may cause short term blindness. If the beam does shine in your eyes, close them and look away immediately. 2, In the case of commercial use, the user of the flashlight should only use this product in accordance with any local laws and regulations.