【EXCELLENT PERFORMANCE】Our music spectrum level indicator is made of high quality materials ,with good durability and stability ,which can be used for a long time .The different colors of light provide a current limiting resistor .Guarantee perfect match 【STRONG PRACTICABILITY】With 8 kinds of display effects ,the user can freely adjust the actual speed of each optical column and main optical column ,and can freely adjust the real light speed of each optical column and main peak for the most suitable display 【ADVANTAGE】The input is isolated by operational amplifier ,and the audio input is isolated by Ti original signal ,which avoids the high frequency interference of single chip microcomputer to series audio circuit 【DIY USE】The level indicator can be used by DIY .It is recommended to have hands on ability and electronic basic personnel to use ,because it needs certain professional technology to ensure accurate installation 【SPECIFICATION】Condition :Brand New， Item Type :Music Spectrum Indicator， Material :Semiconductor， Power Voltage :DC 7V 12V， PCB Size :Approx .80x14mm / 3 . 1x0 . 6in ， LED Module Size :Approx .58x14mm / 2 . 3x0 . 6in ， Line Length :Approx .20cm / 7 . 9in