Square dance stereo is generally used are storage batteries, the battery can not wait for no electricity and then charging, to be diligent charging, shallow charging, over-discharging and over-charging will seriously affect the service life of the battery, it is best to use the voltage with the battery in line with the kind of charger with charging protection.
Audio refers to the combination of electrical equipment issued by the sound of a set of audio systems, audio technology can be divided into the history of the development of electronic tubes, transistors, integrated circuits, field effect tubes four stages.