The Simple Solution HD UV Pet Urine Detector is the tool you need, harnessing the power of ultraviolet light to detect hidden dog and cat urine stains on carpets, bedding or furniture. 21 powerful UV LED lights make urine stains glow in the dark, revealing hidden stains that cannot be detected by the naked human eye! For best results, room should be as dark as possible, ultra-fast cleaning, highlighting, targeting odor, fighting stains like a leader, compact and powerful