In this study, the left and right action switches of the steering wheel are separately connected with the electric temperature of the high and low tones, so that the electric temperature of the high and low tones can be operated separately.The power supply battery (11) is composed of a fuse (12) for protecting the circuit through current protection, a bass temperature control section (21) for controlling a bass temperature action and a treble temperature control section (22) for controlling a treble temperature action. The treble temperature and the bass temperature are banned respectively, and the treble temperature and the bass temperature are operated simultaneously. Not only that, but also has the effect of individual operation.
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