Open the App and select the unit you want to remove.
Once in the device, go into the setting menu.
Once in the setting menu, push Factory reset.
Push Next to complete the action.
Once this has been completed the device will no longer show in your App and it can
be reset for other use.
To reset the device it needs to be plugged in and out of the unit 10 times with a 3 second gap, watching for two flashes
on the unit, once you see a single flash on the unit the device has been reset. At this time it can be added back onto the app