Uv Ultra Violet Blacklight 21 Led Flash Light Torch Aaa

Emitter type: 21 UV LED
Emitted color: purple
Powered by 3 x AAA alkaline batteries (not included) (work time: more than 20 hours)
Aluminum
Waterproof and shockproof
Size: about 9.3 x 3.1 x 3 cm
Please DO NOT look into this device while operating and DO NOT shine in any person's eyes.