Product category: Class D 2.0-channel Bluetooth power amplifier; Working voltage: DC8-24V Output power: rated power 2X15W stereo (24V/8 ohm); Can be connected to 6/8/16 ohm speakers Input mode: 5.0 Bluetooth audio, 3.5mm audio input; 3P2.54mm terminal audio input Performance indicators: efficiency: 90%; harmonic distortion plus noise: Less than 0.2% Gain: 32db; Low quiescent current/noise suppression. Bluetooth indicator status: 1. The flash is no connection state 2 Constant light is a successful connection status 3. Slow flashing is the state of playing music Audio source switching : The default is AUDIO IN (or 3P terminal) Automatically switch to Bluetooth audio source when connected to Bluetooth. Protection function: power input reverse protection/short circuit protection/overcurrent protection, overheat protection, voltage/overvoltage protection Extra function: MUTE/GND interface (short-circuit this interface can achieve mute) PCB: 67mm x 42mm Overall (including heat sink, Knob not included): 67 x 42 x 15mm Potentiometer handle opening: 7mm Mounting hole spacing: 32mm x 32mm Mounting hole size: Material: PCB+Plastic+Metal colour: Black Package Contents: 1 x PAM8620 Bluetooth 5.0 power amplifier board 1 x 3p cable 1 x terminal Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.