This Supa-LED UV detection kit contains a 51-LED ultraviolet torch, a pair of yellow protective glasses, a UV marker pen and a hard storage case. The broad UV beam makes scorpions glow at night and shows up pet urine, hidden stains, marked property and forged banknotes. The yellow glasses improve contrast in low light and protect your eyes from the UV light, and the marker pen writes invisibly so you can mark valuables that show up under UV. The torch has an on/off switch and a battery holder that takes three AAA batteries; use good quality alkaline cells and remove them if storing for long periods. Not a toy: keep away from children and never shine it into the eyes.