TPA7498E HIFI chip solution: Stereo dual-channel output ensures continuous serial high-power operation, 0.1%. Wide voltage input DC: 12-24V; Treble and Bass Control: If you are tired of the inherent high and low bass, why not try the high and low control knobs! This will make you feel like you are in a movie theater. ; Bluetooth and AUX function: Bluetooth 5.0 version, longer mission distance. In an open environment, the mission distance can reach 49 feet. If your playback device doesn't have Bluetooth, you can also input audio signals via a 3.5mm headphone plug. ; Safety protection: This amplifier board has overheating protection, reverse protection, circuit protection, overvoltage and undervoltage protection; Colour:black Material:plastic Package Contents: 1 x Bluetooth Amplifier Board 1 x Screwdriver 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.