A:Answer there is a pinhole at the bottom of the unit. they provide a tool to do this (on a magnet so you can stick it to the inside of the door). if you lost this, use a straightened paperclip. push the tool into hole and you will see the doorbell start to separate from the base - just grab it near the bottom and lift it away from the base. the recharger port is near the top under a rubber protector. to put the doorbell back on, slide the top onto the base at the top and click the bottom into place.