Bedwetting Alarm & Potty Training Watch. Wireless Bedwetting Alarm. Through-wall transmission range is about 10M, parents can know baby's pee status without staying at baby room all the time. Supports Timer Function. 30min/60min/90min/2H timer, reminding your child to go to the toilet or reminding parents to guide kids to toilet. 3 Reminding Modes. Vibration, Sound, Vibration + Sound. Built-in Rechargeable Battery. The transmitter and receiver both have built-in lithium battery, 5V charging voltage and magnetic charging port design make it convenient to be charged by power bank, laptop, car charger or USB power adapter.