XILALU UV Ultra Violet 21 LED Flashlight Mini Blacklight Aluminum Torch Light, lightweight, easy to use material:Aluminum. Emitted color:purple. Emitter type:21 UV LED. DO NOT look into this device while operating and DO NOT shine in any person's eyes. Brand new & high quality. 21 LED UV 395-400 nm flashlight. Long service life. Light weight. Great for checking notes, credit cards, fluorescent inks (invisible inks), cracked glassware, or even crime scene. Powered by 3 x AAA alkaline batteries (not included) (work time:more than 20 hours). shockproof. Note:Due to the intensity of this UV LED device, UV protective glasses are recommended.