3 AA Standard Alkaline Battery (Not Included) Rechargeable batteries are not recommended (Size and Voltage is not compatible)! 51 UV LED beam covers a larger area than 9 21 LED lights. Emits UV light in the 390 to 405 nanometer wavelength. Perfect for outside use such as finding scorpions and minerals! And its useful tool to detect pet urine and do a house deep cleaning.
Tips: To extend the flashlights life please remove all batteries if you did not intend to use it for a long time. Improper use or installation of poor quality batteries may cause product hazards that can affect our safety. We recommend the use of reliable high quality Alkaline batteries. Use of rechargeable or other non-recommended batteries VOIDS the manufacturer warranties.