Abstract: A battery level management system includes a battery module, outputting electric energy, and outputting battery level information according to stored electricity; a control module, receiving the battery level information, and performing encoding according to the battery level information to output a control signal; a constant voltage module, receiving the electric energy to output constant-voltage electric energy, where the control module controls turn-on and turn-off of the constant voltage module through the control signal; and a computing module, receiving the constant-voltage electric energy, and performing decoding according to the constant-voltage electric energy to output the battery level information. The constant voltage module outputs the constant-voltage electric energy with different waveforms according to the control signal, and the computing module obtains the battery level information according to the waveforms of the constant-voltage electric energy.

Abstract: A charging reminder method for a rechargeable device and a memory includes calculating, by an external electronic device of the rechargeable device, the remaining battery power when the rechargeable device is turned off; obtaining, by the external electronic device, the remaining time until the battery reaches the over-discharge point according to the remaining battery power and the quiescent current when the rechargeable device is turned off; sending out, by the external electronic device, at least one charging reminder during the remaining time.

Abstract: A loudspeaker system includes a host processor, a audio output unit, a motion detection module and a voice control module. The host processor is electrically connected to the audio output unit, the motion detection module and the voice control module, respectively. The motion detection module detects a motion of a user. The host processor controls an output signal of the audio output unit according to the detected motion and the voice control module receives a voice command, to enable the host processor to control an operation.

Abstract: An electrical apparatus having a panel is disclosed. The electrical apparatus includes a processor, a touch controller and a display driver. The processor unitsets one of a scan frequency and a display frequency to be a setting frequency, and generates the other of the scan frequency and the display frequency based on the setting frequency. The touch controller makes the panel detects a touch based on the scan frequency, and the display driver makes the panel display images based on the display frequency. The touch controller detects a noise detected value from the electrical apparatus. The touch controller or the processor unitadjusts the setting frequency based on the noise detected value, and adjusts the touch scan frequency or the display frequency which is not the setting frequency based on the setting frequency.