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The 2.1 channel amplifier board is easy to install and use, easy to replace. Bluetooth audio amplifier module is a choice to replace the damaged one, it can provide good performance. The 2.1 channel amplifier module can provide a stable connection and has compatibility. The amplifier card provides input paths: Bluetooth input and AUX input. With the gain module, you can adjust frequency, volume, treble, bass etc.; Product description Size: 118 x 100 x 22 mm. Bluetooth version: 5.0 (shielding, 10m) Input sensitivity: 500mV Audio input: AUX + Bluetooth Channel: 2.1 Chip: TPA3116D2 Power supply: DC 12-24V/5A Speaker adapter: 20-100W 4-8ohm Output power: max. 50 W (R and channel L), max. 100W (subwoofer) Colour: Black Material: ABS Box contents: 1 x Amplifier Card 1 x English User Manual Only the above package, products are not included. Note: Due to lighting effects and different monitors, the color of the item may be slightly different from the pictures. The measurement allowed error is +/- 1-3 cm.; Product description Size: 118 x 100 x 22 mm. Bluetooth version: 5.0 (shielding, 10m) Input sensitivity: 500mV Audio input: AUX + Bluetooth Channel: 2.1 Chip: TPA3116D2 Power supply: DC 12-24V/5A Speaker adapter: 20-100W 4-8ohm Output power: max. 50 W (R and channel L), max. 100W (subwoofer) Colour: Black Material: ABS Box contents: 1 x Amplifier Card 1 x English User Manual Only the above package, products are not included. Note: Due to lighting effects and different monitors, the color of the item may be slightly different from the pictures. The measurement allowed error is +/- 1-3 cm.; Size: 118 x 100 x 22 mm. Bluetooth version: 5.0 (shielding, 10m) Input sensitivity: 500mV Audio input: AUX + Bluetooth Channel: 2.1 Chip: TPA3116D2 Power supply: DC 12-24V/5A Speaker adapter: 20-100W 4-8ohm Output power: max. 50 W (R and channel L), max. 100W (subwoofer) Colour: Black Material: ABS Box contents: 1 x Amplifier Card 1 x English User Manual Only the above package, products are not included. Note: Due to lighting effects and different monitors, the color of the item may be slightly different from the pictures. The measurement allowed error is +/- 1-3 cm.