5-band EQ equalizer and preamp: separate and rich frequency band controls (75Hz/400Hz/ 800Hz/4KHz/10KHz), each band is processed by one op amp independently. EQ5-TONE can compensate for the defects of speakers and sound field by adjusting 5-band high, middle and low frequencies, and modify various sound sources. Adjustable VU meter and Bluetooth input: Dual large VU meter (45mm), driven by a dedicated VU driver chip, supporting the adjustment of background light, pointer speed and Gain, dynamically decorate audio environment and provide incomparably visual effects. Add Bluetooth 5.0 input, convenient for you to enjoy HIFI music via wireless connection.