... price, support tape player, recordable Features of our H-001 car amplifier: 1, this machine can only use 12V battery-powered 2 ... and negative polarity can not be reversed 3, amplified in the car when, 12V battery should be connected at both ends, ... work in the recording button is pressed. Main products: waist hanged amplifiers, portable tour guide loudspeaker, wireless teaching amplifier, and handheld ...