5.1 Bluetooth Digital Power Amplifier Module High Low Pitch Adjustable Stereo Digital Amplifier Board Module DC12‑24V 5A Item Type: Bluetooth Digital Power Amplifier Module Product Material PCB Bluetooth Version: 5.1 Signal to Noise Ratio: 92dB Input Method: Bluetooth, for AUX, USB drive, USB sound card Power Supply: DC12-24V, 5A Sound Output: Passive speaker, 3.5mm interface stereo output Volume Adjustment: Encoder knob adjustment, smoothly touch Output Power: 50W x 2 Frequency Range: 20Hz-30KHz Adapted Speaker: 10W-200W, 4 Ω-8 Ω Bass Channel (subwoofer) Adapter Speaker: 20W-200W, 2 Ω-8 Ω Protection Mechanism: Static electricity protection, overheating protection, overcurrent protection, short circuit protection APP supports for YS APP control