1、Good Performance: This 5 band EQ preamp equalizer uses a full aluminium alloy case and aluminium knurled knobs with good shielding performance, and all I/O interfaces are gold plated to ensure sleek transmission of the original sound signal and minimise signal loss. 2、Bypass Design: This sound 5 band equalizer adopts a bypass design, the bypass mode turns off the EQ preamplification, the sound signal is directly output from IN to OUT without any processing, which is convenient to enjoy the original sound. There is also a balance control to compensate for the left and right channels of all outputs, preventing the soundstage positioning from being off centre. 3、Vintage VU Meter: This Bluetooth EQ preamplifier features dual large VU meters (45mm) driven by a dedicated VU driver chip, which accurately displays the level of the sound signal in real time and dynamically decorates the sound environment for more visual and audible effects. 4、Rich Band Control: This sound digital equalizador has rich band control (100Hz, 400Hz, 800Hz, 4KHz, 10KHz), each band is processed independently by an op amp, which compensates for the defects of the speakers and the soundstage by adjusting the 5 bands of high, middle and low frequencies to improve a variety of sound sources. 5、Wide Application: This sound system professional equalizer has a wide range of applications, with compact size, DC 5V power supply, which is portable and easy to use in most situations, and can be used for home stereo, computer speakers, amplifiers and so on. Item Type: 5 Band Bluetooth EQ Preamplifier MOdel: EQ5-Pro Material: Aluminium Alloy Sound Input: Bluetooth, Stereo RCA, 3.5mm AUX Sound Output: Stereo RCA, 3.5mm AUX EQ Bands: 100Hz, 400Hz, 800Hz, 4KHz, 10KHz Bypass Function: Supported L/R Channel Balance Adjustment: Supported Input Impedance: 50KQ Output Impedance: 15Q Frequency Response: 5Hz-20KHz Total Harmonic Distortion: 0.003% at 1kHz Operating Voltage: DC 5V (>500mA) Power Interface: USB (Type C) VU Meter Diameter: Approx. 45mm / 1.77in Application: Home Stereo, Computer Speakers, Amplifiers 1 x 5 Band Bluetooth EQ Preamplifier 1 x Antenna 1 x USB Data Cable (Type C) 1 x Manual