This is a set of 2 USB UV black light strips in a super bright 395-400nm wavelength. Each strip measures 12" x 0.6" and is waterproof for indoor and outdoor use. The black light strips are powered by a 5VDC battery and controlled by a switch. They are designed in a bar style and suitable for adults to use for occasions like Christmas, parties, or casual settings. Made of plastic, these LED light strips are ideal for any room.