There's a small reset button located on the circuit board. Hold this button down for 3 seconds and the beeping should stop for two more years. Some older models have a slide switch instead of a button on the circuit board. In this case, simply slide the switch the other direction and the beeping will stop. Please make sure your skin and eyes are shielded from the UV light while reseting the reminder (beeping). Can can easily be done by resetting the reminder before connecting a new AHPCO Cell.