Abstract: A battery cover mechanism includes a body member, a battery cover and an operating piece. The body member defines a receiving cavity recessed therefrom for receiving the battery cover and a battery therein. The battery cover is rotatably assembled to the body member to cover the receiving cavity of the body member. The operating piece is releasably assembled to the battery cover for locking the battery cover to the body member and unlocking the battery cover. The battery cover mechanism is convenience to operate, and avoids the interfering signals efficiently.

Abstract: A battery cover latching assembly comprises a battery housing member, a battery cove and a button. The battery cover is releasably mounted to the battery housing member. The button is slidably mounted to the battery cover and has a grip portion forming thereon. When the button is slid away from the battery cover, the grip portion is exposed from the battery housing member to facilitate detaching the battery cover from the battery housing member.

Abstract: A receiving structure for a speaker includes a housing, a filter, a speaker a LED and a circuit board, the housing comprises a receiving cavity, the receiving cavity defines an assembling groove at the bottom, the assembling groove defines a slit at the bottom, the filter is assembled in the assembling groove, the speaker is assembled in the receiving cavity, a LED is assembled adjacent to the speaker, the circuit board encloses the speaker and the LED with the housing. Sound from the speaker and light from the LED pass through the slit to the outside.

Abstract: A battery cover mechanism includes a body member, a battery cover and an operating piece. The body member defines a receiving cavity recessed therefrom for receiving the battery cover and a battery therein. The battery cover is rotatably assembled to the body member to cover the receiving cavity of the body member. The operating piece is releasably assembled to the battery cover for locking the battery cover to the body member and unlocking the battery cover. The battery cover mechanism is convenience to operate, and avoids the interfering signals efficiently.