Usage Tips:Feature: Mini HIFI digital bluetooth audio power amplifier.Add single cycle button to cycle favorite music easily. SD / USB interface, 2 Mic inputs, With Remote control. TF Card, AUX, U disk, MP3 format play, support bluetooth wireless connection. Supports FM stereo radio, Mp3 media Player. With treble, bass, and volume control, very easy to use. Specification: Name: HiFi Audio Amplifier Model: AK45 Pro Audio Channel: 2.0 Rated Power: 50W+50W Max Output: 820W Bluetooth: 5.0 Battery for Remote: AAA x 2 (Not Included) S Ratio: 85db Distortion Rate: 0.5% Rated Frequency: 20-20KHz FM Frequency: 87.5-108MHz Feature: Treble/Bass/MIC Vol Adjustable Input Option: BT/USB/SD//MIC Output Option: Wired Passive Speaker Speaker Impedance: 4-16 ohms Max. Capacity of U-disk: 64G U-disk File Format: MP3/WMA/APE/FLAC/WAV Note: The battery for remote is not included, Pls buy it yourself. Plug Type: EU Plug, it applies to Indonesia, Germany, France, Spain, Italy and so on voltage: 90-240V Material: plastic colour: Black Package Contents: 1 Amplifier 1 x Remote Control 1 Cord 1 x Radio Antenna 1 x English User Manual 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.