. FOSI Audio BT20A Bluetooth 5.0 Stereo Audio Amplifier 100W x 2 2 Channel Class D Amplifier for Home Audio -- 100W x 2 with Bass and Treble Control - TPA3116 Description 100W Max X 2(4 ohms, 20 Hz - 20 kHz, 0.04% THD), comes with a 24V power supply, can drive 280 watts(8 ohms), 320watts(4 ohms) speakers, (For passive speakers only, not powered speakers.) Advanced circuitry design, built-in speakers protection circuit, Home integrated digital amplifier, 12-month warranty, you can return the item if you have any problems; Small simple compact design but practical and powerful, Hi-Fi Bluetooth amplifier exclusively designed for the customers who pursue HiFi sound; Bluetooth 5.0 core, up to 10m connection range guarantees low signal delay. No pop, no audible noise when Bluetooth connection is established; Over 3000 5* ratings on a well known international e-commerce site! Specifications 1. Power supply range: 12v-24v; 2. THD: 0.5%. 3. Frequency Range: 20Hz - 20kHz (±1 dB); 4. SNR: < 98dB; 5. Input sensitivity: > 280mV; 6. Bluetooth transmission distance: 9m; 7. Terminating impedance: 2Ohm - 8Ohm; 8. Output power: 100W + 100W; 9. Input mode: Bluetooth and Analog; 10. Bluetooth Name: Fosi Audio 11. Bluetooth chip: Qualcomm QCC3003 12. Power supply: 24V 4.5A 13. Supplied Accessories: Amplifier, Power supply, AC power cord What's in the box 1 x BT20A Amplifier 1 x Power Supply 1 x Manual