Audio Power Amplifier 2.1 Channels Bluetooth Amplifier Board Module AMP Board for Laptop PC Item Type: Audio Power Amplifier Product Material: PCB Bluetooth vVersion: 5.1 Input Method: Bluetooth, AUX, USB drive, USB sound card. Channels: 2.1 channels, left and right channels as well as bass channels. Volume Adjustment: high end encoder knob adjustment, smooth touch. Power Supply: DC 18-38V, ≥ 10A Voltage Gain: 30dB Output Power: Left and right channels ≤ 220W, bass channels ≤ 350W. Adapted Speaker: Left and right channels 30-220W 3-8 Ω, bass channels 30-350W 2-8 Ω Protection Mechanism: Static electricity protection, overcurrent protection, short circuit protection, overheating protection. APP Function: Supports for YS Audio APP control.