Product features: 1. 2 HIFI inputs, 1 6-channel AV input. outputs consist of 3 operational amplifiers, and the kit includes 3 NE5532 amplifiers. Customers can upgrade the operational amplifiers to improve sound quality. 2. front, surround, center, subwoofer channel volume can be adjusted independently or uniformly. with shutdown status memory function 3. with OLED display, all infrared remote control. Mechanical wear without potentiometer, long service life 4. HIFI channels for lossless playback. Convenient power supply, the TYPE-C interface of the phone charger is sufficient. Low power consumption. 5. gold-plated terminal outputs, low loss, and good sound quality Power supply voltage: DC 5V (TYPE-C can be achieved by using an Android phone charger and charging cable) Input: 1 set of 6 vocal cords plus 1 channel of 2 channel input Output: 1 set of 6-channel outputs Use: 1. Enter switch L: Press the multifunction knob, not rotate it, until the points to the top left corner, Select a multi-function knob. Cut to AUX or 5.1CH 2. High pitch adjustment: Press the multifunctional knob, to the points to:turn the multifunctional knob, you can adjust 3. High pitch adjustment: Press the multifunctional knob, to the pointing to L:turn the multifunctional knob, you can adjust 4. Volume Adjustment The volume is adjusted when the points to the maximum number displayed on the display. the default rotation is 6 tracks Increase and decrease together, and when you want to switch control of a channel, use the remote control The middle of the big circle key switch, and then rotate the volume potentiometer +N approximately = 0.0009%. Frequency response: 20HZ-20KHZ Less than -0.02DB Material: PC+metal colour: green Package Contents: 1 x DLHiFi F11 M62446 Preamp 1 x remote control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.