Mini audio amplifier module DIY kit is easy to assemble and can easily fit your audio system. With 2.1 channels (L/ R/ Subwoofer), AUX + BT input mode, FREQ, TREBLE, BASS and volume adjustment, good heat dissipation, multiple protections, the module can bring you wonderful music listening experience. Note: Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black Material: PCB BT Version: BT 5.0 Input Mode: AUX + BT Channel: 2.1 Output Power: 50W x 2 (Left and Right Channels), 100W (Subwoofer) Chip: Power Amplifier Chip Power Supply: DC 12-24V Speaker: 4-8Ω, 20-100W Package Size: 13.5 * 11.2 * 5cm / 5.31 * 4.41 * 1.97in Package Weight: 248g / 8.73oz Package List: 1 * BT Audio Amplifier Module DIY Kit