Can I adjust the volume on the tone/buzzer? October 08, 2024 23:36 No, the volume on the tone/buzzer is preset. The tone/buzzer starts low and gradually increases the volume. Related articles POWERVALET PRO (iW23) The volume (VOL+ or VOL-) cannot be adjusted. How to Set the Alarm? Can I use this unit in other countries? What’s the warranty period for this product?