. The Fosi Audio BT20A Pro is a new generation Bluetooth amplifier integrating the high-performance Texas Instruments 3255 amp chip, which can bring up to 300W power per channel and allows ultra-low distortion across the audio band and superior audio quality. With tone controls, you can adjust the treble and bass in catering to your own preference. The BT20A Pro is designed and made to bring you a whole new music enjoyment experience. It's Pro and Beyond Your dream of having exceptional music will become true with this amplifier. It makes sound crystal clear and sweet which enables you to feel the power from music vibrating from your soul. Specifications: Max Power Output: 300Wx2 @4Ω SNR: ≥108dB Terminating Impedance: 2-8Ω THD: 0.005% Power Amplifier Chip: TPA3255 Power Supply: 32V 5A Input Range: DC 24V-48V Frequency Response Range: 20Hz- 20kHz(±1.2dB) Bluetooth Transmission Range: Up to 50Ft Bluetooth Codec: AAC/SBC Input and Output Audio Input: RCA/Bluetooth Audio Output: Speaker Output/3.5mm Pre-out What's in the box 1. BT20A Pro × 1 2. User Manual × 1 3. Bluetooth Antenna × 1 4. 32V/5A Power Supply × 1