The clock is held against the wall using a strong magnetic force and a powerful VHB adhesive. To remove the clock, slide it down, up, or on either of the two sides. Remember not to pull the clock, or else it may damage either the surface of the wall or that of the clock.
After you remove your clock, you can use NED Magnet with another product in the same place. You can also attach the NED Magnet to the clock and hang it on another wall with an Alpha Steel Tape.