Feature:1. Sound Control: If you're tired of the inherent highs and lows, why not try the treble and bass control knobs! This will give you the feeling of being in a movie theater.2. Long Transmission Distance: The module uses Bluetooth version 5.0 for longer transmission distance, up to 33 feet in an open environment.3. Basic Performance: Stereo dual channel output ensures continuous serial high power operation with THD 0.1%, wide voltage input DC1224V.4. 3.5mm Jack: If your playback device does not have Bluetooth, you can also input audio signal through the 3.5mm headphone plug.5. Safety Protection: This audio amplifier board has overheat protection, circuit protection, overvoltage and undervoltage protection.Specification:Item Type: Audio Power Amplifier BoardMaterial: PCBBluetooth Version: 5.0 (unobstructed, 10m)Signal to Noise Ratio: >90dBInput Mode: AUX and BluetoothNumber of Channels: Left and right dual channel (stereo)Power Amplifier Chip: TPA3116D2 (with AM interference suppression function)Power Supply: DC 12-24V, 5A or more (the higher the voltage, the higher the output power)Applicable Speakers: 20-200W, 4-8 Output Power: 2 x 20W at 12V,8, 2 x 35W at 12V,4, 2 x 35W at 19V,8, 2 x 60W at 19V,4, 2 x 50W at 24V,8, 2 x 100W at 24V,4Protection Mechanism: Overvoltage, undervoltage, overheat, DC detection, short circuit protection.Package List:1 x Audio Power Amplifier Board3 x Rotation Knob1 x Screwdriver2 x Protective Shell8 x Screw8 x Nut