This is the Magic Remote. Remove the batteries and leave the battery lid hanging loose.

Remove the Volume up/down and Channel up/down plastic pieces by inserting a small screwdriver in the edge to prise off each plastic piece.

The white plastic ring that surrounds the black control buttons can be removed after the Volume and Program up/down pieces have been removed. Start at the edge nearest to the Volume and Program controls and gently lift the edge up. You can use a thumb nail inserted between the ring and the grey base to release it all around the top.