Release the Top Panel and Control Buttons:

Still on the underside of the clock, press the two plastic release tabs at the seam between the front and back panels.

Note: You may need the help of a flathead screwdriver if you can’t release the tabs with your fingers.

If you feel a snag, check the following seven internal release tabs. Generally, these are not an issue and the clock will easily pop apart releasing the top panel. If this is not the case, you can use a flathead screwdriver to release any stubborn tabs. The seven internal tabs are located:

Two are directly above and below the CANCEL button on the top panel.

Two are directly above and below the FWD button on the top panel.

Two are directly above and below the AM/FM switch on the side of the clock.

One is between the TUNING and VOLUME dial on the other side of the clock.