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 Module Material: printed circuit board Model: ZX-MT21 Audio input: AUX+BT Voltage: DC12-24V Channel: 2.1(50W+50W+100W) Current: 9A R&L speaker: 4-8; 15-100W BT: 5.0 Subwoofer: 4-8; 15-100W Subwoofer frequency: 20-200Hz Item size: 93 * 90 * 22mm / 3.66 * 3.54 * 0.87in Item weight: 130g / 4.59ounce Package size: 100 * 100 * 30mm / 3.94 * 3.94 * 1.18in Package weight: 185g / 6.53ounce Packing List: 1 * Power Amplifier Module