Features 1、BT 5.1 version, with an effective distance of about 10 meters, PlugAndPlay, quick connection. 2、Can be easily connect to your mobilephone, computer, TV, speaker, etc. 3、Six lownoise preamplifiers enhance sound quality and volume, with high gain and a gain parameter of 30dB. 4、Clearly distinguish the power input terminal from the speaker wiring terminal to avoids connecting the speaker to the power terminal and burning the speaker. 5、Protections: AntiReverse connection, undervoltage protections, overheating protections, overcurrent and shortcircuit protections (can automatically recover, no need to restart). 6、Four audio input ways: BT, AUX, U Disk and USB sound card. Specification Color: black BT: 5.1 Chip: TPA3255 Compatible power: DC16-38V, ≥10A Output power: left and right channels ≤220W, subwoofer ≤350W Compatible speaker: left and right channels 30-220W, 3-8Ω; subwoofer 30-350W, 2-8Ω Item size: 141 * 131 * 27mm / 5.6 * 5.2 * 1.1in Item weight: 346g / 12.2ounce Package size: 170 * 140 * 50mm / 6.7 * 5.5 * 2.0in Package weight: 408g / 0.9lb Package List 1 * Power Amplifier Board Module