This is a Japanese-made LED black light from South Walker, using three Nichia Chemical UV-LEDs. It's a high-quality product certified IP55/IP57 for dust and water resistance, using three Nichia Chemical UV-LEDs. It is said that only the highest rank 10 and 11 UV-LEDs from Nichia Chemical are used. It is already sold out on South Walker's official online shop (Yahoo Shopping). Product model number: UV-LED375-03NB1A Retail price: 8,800 yen Size: 22mm diameter, 105mm length Weight: 71g (including batteries) Uses one AA battery (battery included) UV wavelength: 375nm I'm selling it because I haven't used it much after purchasing it.