product nameBluetooth digital amplifier boardProduct numberXY-P40WOperating VoltageDC: 5~24VBluetooth version5.0Transmission distance15 meters (visible and unobstructed)Number of channelsTwo channels (stereo)Output power (@1KHz)20W*2 @12V 4Ω30W*2 @16V 4Ω30W*2 @21V 8Ω40W*2 @24V 8ΩAdapter speaker (40W~200W)4 ohms (5~16V power supply)8 ohms (5~24V power supply)Module protection mechanismReverse power protectionShort circuit protectionSelf-recovery overheat protection