Feature:1. STRONG COMPATIBILITY: The amplifier board is equipped with wiring board and DC 2.1mm socket, which is compatible with most laptop power ports.2. BLUETOOTH 5.0 VERSION: The amplifier module can be directly connected to Bluetooth 5.0 and used to modify speakers, power amplifiers, automotive Bluetooth devices.3. GOOD FILTERING EFFECT: The digital power amplifier board has a built in filter capacitor that can be used to process sound signals.4. EASY ADJUSTMENT: The design of the rotary potentiometer of the audio power amplifier board facilitates the adjustment of power on off, V+, and V.5. MULTIPLE PROTECTIONS: With reverse connection, overvoltage, undervoltage, over temperature, short circuit, and self recovery overheating protection, this power amplifier is very safe to use.Specification:Item Type: Bluetooth Power Amplifier BoardMaterial: PCBBluetooth Version: 5.0 (unobstructed, 15 meters)Adapted Power Supply Voltage: 5-24V (optional adapters such as 9V 12V 15V 18V 24V, high voltage recommended for high power applications)Number of Channels: Left and right dual channels (stereo)Adapted Speaker: 30-200W, 4, 8Adapted Power Supply: DC15-36V (undervoltage protection below 9V, can also support 12V power supply)Protection Mechanism: Self recovery overheating protection, self recovery short circuit protection.Package List:1 x Bluetooth Power Amplifier Board1 x Upper Cover Plate1 x Lower Cover Plate1 x Knob Cap8 x M2x6mm Screw4 x M3x12 Copper Column1 x Screwdriver1 x Gasket1 x Screw1 x Power Cable