Remove Digital Clock/Timer From Dual Mount Bracket - Primex XR Classic Series Install Manual

Dual-Sided Digital Clock Dimension (B)
Dual-Sided Digital Clock Dimension (C)

Remove Digital Clock/Timer from Dual Mount Bracket

2.5" x 4 and 2.5" x 6 - from the top of the bracket, using a screwdriver press each hook down to release the clock. Then pull out to
unsnap bottom hinges.
4" x 4 and 4" x 6 - from the top of the bracket, insert a thin screwdriver into each notch and gently move the screwdriver sideways
to unlock the clock. Then pull clock forward and up to unsnap. Lift out.
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XR Classic Series Digital Clocks/Timers Install Guide