MT21 2.1-Channel BT AUX Digit Audio Power Amplifier Module High Power Sound Amp Suitable for 20-100W Horns This is a kind of quality audio amplifier module, which adopts quality electronic component, with accuracy process, which ensures fine durability and long service time. AUX+BT audio input, subwoofer+left and right channels output. Multiple protections design, reversed polarity, overtemperature, overcurrent and short circuit are protected. You can have a try.Features:Adopts quality electronic component, with accuracy process, which ensures fine durability and long service time.Fine contact performance, that ensure stable working.AUX+BT audio input, subwoofer+left and right channels output.Adopts quality chip, unfiltered output, with standard sound quality.Built-in 36*25*10mm cooling fin, with fine heat dissipation effect.Multiple protections design, reversed polarity, overtemperature, overcurrent and short circuit are protected.Specifications:Name: Power Amplifier ModuleMaterial: printed circuit boardModel: ZX-MT21Audio input: AUX+BTVoltage: DC12-24VChannel: 2.1(50W+50W+100W)Current: 9AR&L speaker: 4-8; 15-100WBT: 5.0Subwoofer: 4-8; 15-100WSubwoofer frequency: 20-200HzItem size: 93 * 90 * 22mm / 3.66 * 3.54 * 0.87inItem weight: 130g / 4.59ouncePackage size: 100 * 100 * 30mm / 3.94 * 3.94 * 1.18inPackage weight: 185g / 6.53ouncePacking List:1 * Power Amplifier Module