I bought this to help with my child's bedwetting, but they didn't want to wear it, so I'm selling it unused. I purchased it on Amazon for about 10,000 yen. It seems safe to use since it was developed by the company that makes wetstop3. Here's the product description: 【3 Modes: Light, Sound, and Vibration】Alarm designed to be easily noticed even by children with deep sleep. Developed in accordance with domestic standards by MDK Co., Ltd., the makers of Wetstop3. 【Easy-to-Attach Design】The main unit clips to the pajamas, and the sensor simply attaches to the outside of the pants. 【High-Sensitivity Sensor for Quick Wetness Detection】Supports nighttime "awareness" and helps establish toilet habits. 【Sensor is Washable】You can use it hygienically because it's something you use every day. 【Record Calendar Included】Includes a record calendar and examples. Visualizes daily efforts. Additional copies can be downloaded as needed. 【Battery Operated: 2 AAA Alkaline Batteries (sold separately)】Easy to use on the go or when traveling, and you don't have to worry about running out of charge. 【Official MDK Support】Accepts consultations regarding malfunctions, inspections, repairs, etc., for long-term use. 【Color】White 【Set Contents】Main unit, sensor cord, instruction manual for parents and children, record calendar + examples Bedwetting Alarm Nocturnal Enuresis wet stop 3 wetstop3 POM, MDK