Abstract: A speaker assembly includes a sound chamber, a speaker and a diaphragm. The speaker is set at one end of the sound chamber. The diaphragm is set at one side of the sound chamber. The sound chamber, the speaker and the diaphragm form a closed cavity, thus to reduce the high tone from the speaker to a mid-bass pitch. An electronic device using the speaker assembly is also provided.

Abstract: A guiding device to conduct a rechargeable device to a recharging station includes a motherboard and a microphone module. The microphone module is mounted on the motherboard and receives charging requests from the rechargeable device. The microphone module is configured to continuously transmit and update signals specifying a position of a predetermined charging area to the rechargeable device. The microphone module can identify a position of a sound source so as to guide the rechargeable device to the predetermined charging area. The microphone module can receive signals constituting charging request from any position throughout a full 360 degrees around the guiding device.