Upgraded Design: Add Bluetooth to a subwoofer amplifier. M01-BT support Bluetooth and RCA input can drive most home passive speakers, passive subwoofers, and powered subwoofers. (Note： M01-BT is not suitable for active speakers). Easy to build a simple sound system with M01-BT. Mini compact Class D Audio Amplifier. M01-BT SUB amp adopts ST Microelectronics TDA7498E high-performance chip, MAX power output up to 300Watts. Switch to PBTL(As a full frequency mono amp): You can use the banana plugs or bare wires to connect the passive subwoofer to the M01-BT, use the RCA cable to connect the powered subwoofer to the M01-BT. Switch to SUB(As a subwoofer amp): You can use the banana plugs or bare wires to connect the passive subwoofer to the M01-BT, use the RCA cable to connect the powered subwoofer to the M01-BT. What you Get: M01-BT amplifier x1, Bluetooth antenna x1, User Manual x1, 24V/4.5A Power Adapter x1, AC Cord x1, 18-month worry-free warranty, and friendly customer service. Model M01-BT MAX Power Output 300W RMS Power Output RMS220W@4Ω, RMS 110W@8Ω Terminating Impedance 2-8Ω Input Mode Bluetooth + RCA Output Mode Passive Speaker + Powered Subwoofer Frequency Range 20Hz - 20kHz (±3 dB) Bass Frequency Range 20-200Hz THD ≤0.05% SNR ≥ 102dB Input Sensitivity ≤ 0.2mV Chip Set TDA7498E DC Input Range 24-32V Power Supply 24V 4.5A