Used for about a month. No box or instruction manual. I have confirmed that the alarm sounds when the sensor gets wet. The batteries will be removed before shipping. No instruction manual is included, but you can find information online or on YouTube. Please refer to those resources. Product Description The bedwetting monitor "Wet-Stop 3" is an alarm device used to treat nocturnal enuresis in children. Developed in the United States in 1979, it is a product that is well-versed in nocturnal enuresis and alarm therapy.