Wireless Bedwetting Alarm USB Rechargeable Sound Vibration Alarm Bedwetting Sensor Item Type: Bedwetting Alarm Material: ABS Receiver Built-In Battery: Lithium battery 350mAh Transmitter Built-In Battery: Lithium battery 80mAh How e: turn the switch to the right receiver to power on, to the left receiver to power off, the transmitter is always on by default Alarm Consists of Three Parts: Transmitter (Urine Detection) : Detection of urine wirelessly sends an alarm message to the receiver Receiver: The receiver is used to receive the alarm information of the transmitter and notify the user through vibration or sound. It has the function of temperature and humidity detection and is used for temperature and humidity detection of the current environment. Charging Box (Storage Box) : It is used for charging the transmitter and receiver. It is convenient for users to store and carry when it is not charged by covering the cover.Effective connection distance: within 20 meters