This is a replacement receiver and transmitter for the Rodger Wireless Bedwetting Alarm System. The receiver is the part that plugs into the wall (or uses batteries) and generates the sound that awakens your child. The transmitter is the smaller, circular part that attaches to the Rodger Sensor Briefs. The two can be paired. You can find instructions for pairing on Bedwettingstore.com
This item has been used but has been reconditioned back to factory standards. It is guaranteed to work when it arrives.