Patent ID: 8559182

Claim:
An electronic device comprising: a device module comprising: a key input portion comprising a plurality of key contacts; a display portion; a power supply portion; a circuit board that is electrically connected to the key input portion, the display portion and the power supply portion; a sheet member, wherein the key input portion, the display portion, the power supply portion, and the circuit board are entirely enveloped by and hermetically sealed with the sheet member; a key sheet mounted on the key input portion and comprising a plurality of key tops thereon, wherein each of the key tops is provided to face a corresponding one of the key contacts a device casing housing the device module and the key sheet therein and comprising: an upper casing having a plurality of openings therethrough, wherein each of the key tops is exposed from a corresponding one of the openings; and a lower casing that is detachably attached to the upper casing.