Highly performances amplifiers board: 300W*2+600W fever grade bluetooth-compatible amplifiers board module, with strong output power, meeting the needs of music enthusiasts. Highly and low frequency adjustment: equipped with treble frequency adjustment function, users can freely adjust sound effect according to your preference. Double channel stereo: Supports double channel output to achieve stereoed sound effects, making music 3d and full, bringing immersived auditory enjoyment. Bluetooth-compatible connection: With build-in bluetooth-compatible function, it is convenient to wirelessly with various bluetooth-compatible devices, achieving convenient transmission. Product Name: Bluetooth-compatible Amplifiers Board Bluetooth-compatible version: Bluetooth5.2 Frequency: 20Hz-20KHz adjustment: adjustment of Highly and low frequency Colour:Black Material:plastic Specification: C:Potentiometer external Package Contents: 1 x Bluetooth Digital Amplifier Board Module 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.