Simple Solution Spot Spotter HD UV Pet Urine Detector uses ultraviolet light to reveal dog and cat urine stains on your carpet, bedding, or furniture;Using 21 powerful ultraviolet LEDs, the Spot Spotter makes urine stains glow in the dark, revealing hidden urine stains;Spot and eliminate dog and cat urine stains at their source that are undetectable to the human eye;Use in conjunction with Simple Solution Stain + Odor remover to completely eliminate all traces of urine stain and odor;Requires three (3) AAA batteries (included with package)