To release the back from the Halo device, grab the top and bottom of the unit and gently pull the Halo away from the rear housing or desk stand, This will reveal the location of the 4 x AA batteries in the device. Replace with 4 x AA Alkaline batteries, ensuring the correct battery orientation.
Once changed, position the Halo back onto the desk stand or wall mount.
The Halo will go through a short synchronisation process while it reconnects with your Halo smart interface. The Halo will then return to the home screen.