TPA7498E HIFI chip solution: Stereo dual-channel output ensures continuous high-power operation with 0.1% total harmonic distortion. Wide voltage input DC: 12-24V. Treble and bass control: Adjust the sound to your preference with dedicated high and low frequency control knobs, enhancing your audio experience. Bluetooth and AUX function: Equipped with Bluetooth 5.0 for stable connectivity and longer transmission distance, up to 49 feet in open space. Audio can also be input via 3.5mm auxiliary input for non-Bluetooth devices. Safety protection: Features overheat protection, reverse polarity protection, short circuit protection, overvoltage and undervoltage protection. Color: Black. Material: Plastic. Package includes: 1 x Bluetooth amplifier board, 1 x screwdriver. Only the listed items are included; other items are not part of this package. Note: Lighting and display differences may cause slight color variations between the image and actual item. Measurement tolerance: +/- 1-3 cm.