Dual 32 Stereo Music Spectrum parameter : Voltage: DC voltage 8-32V Size: 120X35MM Current: 20mA (standby) Display size: 82X22MM hole size: 28X85MM Connection method: Pre-amp or speaker positive Adjustable sensitivity of LED 32-segment audio indicator Overall size: 120X17MM Display size: 82X10MM Voltage: 8-24V interface: IN audio signal input (the signal is recommended to be connected to the front stage (the front end of the amplifier volume), and the rear stage (output end) should be considered for the treble, midrange, and bass. The effects of the three tones are different. It's different. For example, if you connect to the treble, you can't see the bass instrument sound, and if you connect to the bass, you can't show the voice of the character GND: negative pole of power supply VCC: Positive power supply Dual 16 Stereo Music Spectrum parameter : Voltage: DC voltage 8-32V Size: 100X32MM Current: 20mA (standby) Display size: 84X24MM Connection method: Pre-amp or speaker positive RINRight channel LINLeft channel VCCPositive power supply (between 5-30V) GND power negative Note: The mobile phone charger needs to directly connect the two tin points at the R position on the back of the board. The R power supply after connection can only be 5V-5.5V power supply. Remember not to use a power supply higher than 5.5V. This board is anti-reverse Wrong connection will not burn out. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.