Features 1、It is a portable power amplifier board for 2.1CH speakers. 2、This product using high performances digital power amplifier chip, one to do parallel bridged bass channel power amplification output, one to do left and right channel power amplification output. 3、Support 100W (bass channel) + 50W (left channel) + 50W (right channel) 2.1-channel output. 4、Support BT5.0 audio reception , external audio input interface, with preamplifier, bass crossover processing. 5、Bass-volume, bass frequency, left and right channel-volume, treble, function control switch / total-volume, 5 adjustment potentiometers. 6、Wide working voltage, energy-saving design, efficiency up to 90%. Specification The board is a finished board that has been soldered and tested. Connect the speaker box, then connect the appropriate power and connect to the BT audio device to play, or connect the sound source input correctly. Features: It is a portable power amplifier board for 2.1CH speakers. This product using high performances digital power amplifier chip, one to do parallel bridged bass channel power amplification output, one to do left and right channel power amplification output. Support 100W (bass channel) + 50W (left channel) + 50W (right channel) 2.1-channel output. Support BT5.0 audio reception , external audio input interface, with preamplifier, bass crossover processing. Bass-volume, bass frequency, left and right channel-volume, treble, function control switch / total-volume, 5 adjustment potentiometers. Wide working voltage, energy-saving design, efficiency up to 90%. Specifications: Material: metal Amp chip: TPA3116D2 BT: 5.0 Output impedance: left and right channel: 4-8Ω, bass channel: 2-8Ω Output power: 50W+50W BT distance: ＞8m Frequency range: 20Hz-20KHz Item size: 101 * 100 * 30mm / 3.9 * 3.9 * 1.2in Package size: 150 * 110 * 40mm / 5.9 * 4.3 * 1.6in Package weight: 209g / 7.4ounce Packing List: 1 * Power Amplifier Board 1 * Set of Installation Tools Package List 1 * Power Amplifier Board 1 * Set of Installation Tools