Class D 2.0 channel Bluetooth power amplifierWorking voltage: DC8-24VOutput power: rated power 2X15W stereo, can be connected to 4/6/8 speakersInput mode: 5.0 Bluetooth audio, 3.5mm audio input, 3P-2.54mm terminal audio inputEfficiency: Greater than 90%Total harmonic distortion plus noise: Less than 0.2%Gain: 32dbLow quiescent current/noise suppressionBluetooth indicator status:1. Fast flashing means no connection2. Constant light means the connection is successful3. Slow flashing is the state of playing musicAudio source switching method: the default is Audio in (or 3P)Automatically switch to Bluetooth audio source when connected to BluetoothProtection function: power input reverse protection/short circuit protection/overcurrent protection/overheat protection/undervoltage/overvoltage protectionsizesize: 67mm(L) x 42mm(W) x 15mm(H)Potentiometer knob opening: 7mmMounting hole spacing: 32mm x 32mmMounting hole size: M3Colour:blackMaterial:plasticPackage Contents:1 x Power Amplifier Board1 x Acrylic ShellOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.