Feature: Portable HIFI Digital Bluetooth and AUX Audio Power Amplifier. Support Microphone , TF Card, U-Disk, AUX, MP3 play and BT Connection.Support DC/AC power in, Suitable for Home and Car.Support FM Radio With Treble, Bass, and Volume control, Very easy to use.Low distortion supplies clearer, stronger and more powerful sound. With Remote control, Easy to adjust volume. Channel 2.0 output. How to match the AMP and Speaker: 1. The impedance of the amplifier is the same as the speaker, can not be too far apart.2. The power of the amplifier is 1.5 times than speaker to obtain a enough sense of strength. Specification: Type: Digital HIFI Power Amplifier Support: Microphone/Bluetooth/SD/TF/USB/AUX/RCA Input Function: Power AMP/Music Player/FM Radio Microphone: 6.5mm microphone Jack RCA Input: PC /MP3 /DVD /CD etc at rear Audio output: L/R 2.0 Channel Bluetooth Version: 5.0 USB Version: 2.0 Output Parameter: Max Power: 45W+45W () Rated Power: 15W+15W Rated Impedance: 4-8 Distortion: 0.02% S Rate: 92db If the output impedance of the amplifier requires 4-8, the impedance of your speaker should also be 4~8, the sound of 4 ohms is louder, and the 8 ohms is smaller; If the output power of the amplifier is 35W, the speaker should be around 20W. For the 1.0 channel, the speaker power is 20-30W, for the 2.0 channel, it is 2x(20-30)W. If the amplifier is full frequency, the the frequency response of the speaker, the better, such as 100~18KHZ Plug Type: EU Plug, it applies to Indonesia, Germany, France, , Italy and so on voltage: AC220V Material: plastic colour: Black Package Contents: 1 x Digital video player 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.