Abstract: A battery holding device is provided for preventing erroneous charging when being electrically connected to a power source. The battery holding device includes a battery holding mechanism and a charging control module. The battery holding mechanism is adapted to selectively accommodate a rechargeable first battery or two non-rechargeable second batteries. The charging control module is configured to control an electrical connection between the battery holding mechanism and the power source, and includes a sensor and a control unit. The electrical connection is allowed by the control unit to permit the first battery to be charged by the power source only when the first battery is installed in the installation space.

Abstract: A battery holding mechanism is adapted to selectively accommodate a first battery having a larger outer diameter, or two second batteries each having a smaller outer diameter. The battery holding mechanism includes a battery holder and a resilient positioning member. The battery holder defines therein an installation space configured to permit only the first battery or only the second batteries to be installed. When the first battery is installed, the first battery is positioned by the resilient positioning member. When the second batteries are installed, the second batteries are positioned by the resilient positioning member in a juxtaposed manner.

Abstract: A battery holding device is provided for preventing erroneous charging when being electrically connected to a power source. The battery holding device includes a battery holding mechanism and a charging control module. The battery holding mechanism is adapted to selectively accommodate a rechargeable first battery or two non-rechargeable second batteries. The charging control module is configured to control an electrical connection between the battery holding mechanism and the power source, and includes a sensor and a control unit. The electrical connection is allowed by the control unit to permit the first battery to be charged by the power source only when the first battery is installed in the installation space.

Abstract: A battery holding mechanism is adapted to selectively accommodate a first battery having a larger outer diameter, or two second batteries each having a smaller outer diameter. The battery holding mechanism includes a battery holder and a resilient positioning member. The battery holder defines therein an installation space configured to permit only the first battery or only the second batteries to be installed. When the first battery is installed, the first battery is positioned by the resilient positioning member. When the second batteries are installed, the second batteries are positioned by the resilient positioning member in a juxtaposed manner.

Abstract: An input-panel-equipped portable speaker device includes a cabinet shell body configured to enclose an accommodation chamber in a longitudinal direction, and having left and right mounting walls opposite to each other in a transverse direction. The left mounting wall has an inner peripheral region defining a fitting opening. The right mounting wall has a positioning groove. An input panel is connected with an amplifier circuit board, and is disposed to cover the fitting opening. When a right board edge of the circuit board is brought to be fitted in the positioning groove, an outer peripheral region of the panel is brought to abut against the inner peripheral region so as to enable an air-tight engagement therebetween.

Abstract: A portable speaker device includes a cabinet shell body for receiving a speaker driver at a front tubular end thereof. A top wall of the cabinet shell body has a concavity defined by a recessed surface portion and front and rear inner surface portions. A handle lever is configured to be fitted into the concavity, and has a fulcrum region pivotally mounted to the rear inner surface portion, a weight region disposed proximate to the front inner surface portion to be angularly displaceable between laid-down and lifted positions, and a power region interposed and configured to facilitate gripping. A biasing member is disposed to bias the weight region to the laid-down position. A lift limiting member is disposed to limit the movement of the weight region to a predetermined distance when lifted toward the lifted position.

Abstract: An input-panel-equipped portable speaker device includes a cabinet shell body configured to enclose an accommodation chamber in a longitudinal direction, and having left and right mounting walls opposite to each other in a transverse direction. The left mounting wall has an inner peripheral region defining a fitting opening. The right mounting wall has a positioning groove. An input panel is connected with an amplifier circuit board, and is disposed to cover the fitting opening. When a right board edge of the circuit board is brought to be fitted in the positioning groove, an outer peripheral region of the panel is brought to abut against the inner peripheral region so as to enable an air-tight engagement therebetween.

Abstract: A wireless microphone includes a grip that includes a barrel. The barrel includes a barrel body that is configured with a battery receiving space and that has one side formed with a cutout for access to the battery receiving space. The grip further includes a lid coupled to the barrel body and operable to a closing state for closing the cutout. The grip also includes an external thread formed on the barrel and the lid and constituted by a first thread part on the barrel and a second thread part on the lid. The wireless microphone further includes a retainer configured for threaded connection to the external thread to retain the lid in the closing state.

Abstract: A wireless sound amplification system with microphone based volume control includes a wireless microphone and an audio system. The wireless microphone includes an audio pickup unit for converting sound to an audio signal, an adjustment unit configured to receive an adjustment user input, and a processing unit. The processing unit includes an amplifier configured to use a first amplification gain to amplify the audio signal from the audio pickup unit and to thereby generate an amplified audio signal. The processor further includes a controller unit configured to output a control signal based on the adjustment user input received by the adjustment unit. The processor further includes an encoder that generates a transmission signal by encoding the amplified audio signal from the amplifier and the control signal from the controller unit. The wireless microphone also includes a transmitting unit.

Abstract: A wireless microphone includes a grip that includes a barrel. The barrel includes a barrel body that is configured with a battery receiving space and that has one side formed with a cutout for access to the battery receiving space. The grip further includes a lid coupled to the barrel body and operable to a closing state for closing the cutout. The grip also includes an external thread formed on the barrel and the lid and constituted by a first thread part on the barrel and a second thread part on the lid. The wireless microphone further includes a retainer configured for threaded connection to the external thread to retain the lid in the closing state.