Once The Button Plate Has Been Removed To Reveal The Switch And Lamp Housing, Do Not Pull The Assembly Arbitrarily, Otherwise, May Lead To The Damage; Holding The Lamp Housing Between Your Index Finger And Thumb, Gently Remove The; Twisted In Its Housing - Sega Transformers Human Alliance Owner's Manual

17-3 Once the Button plate has been removed to reveal the Switch and
Lamp housing, do not pull the assembly arbitrarily, otherwise, may
lead to the damage
17-4 Holding the Lamp Housing between your index finger and thumb,
gently remove the housing from the button cover. Always hold
firmly onto the housing but not the wires, and remove the lamp from
the lamp housing, The Lamp is a push-fit and should not be twisted
in its housing.
Replacing the lamp with a same type lamp or re-assembling should follow the same
instructions.
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http://op.sega.jp/op_e/
Lamp-LED
5V DC