Repositioning and removing the SimpliSafe Wireless Security System's sensors is easy. Just push up on the front of the sensor in the direction of the blue arrow – the back will stay on the wall and the white adhesive tape tab will be visible. Pull DOWN (NOT OUT) slowly on the tab until the sensor is removed from the wall. (Note: to remove an Entry Sensor magnet, just rotate the magnet slowly until the adhesive releases from the wall.) When you are ready to re-adhere the sensor in a new location, use a fresh piece of adhesive tape (extras are included with your System and you can contact us if you need additional tapes). No, the adhesive shouldn’t damage your walls. SimpliSafe uses a special adhesive tape that will adhere strongly to your walls, but can be removed easily when you’re ready and should not damage your walls. Just pull down on the adhesive’s tab to stretch the adhesive and remove it from the wall.