Photo 1 of Bluetooth 5.1 Audio Amplifier Board, ZK-AS21 2.1 CH 220W x 2 + 350W HiFi Subwoofer Power Amp Mini Digital Audio Amp Module for Home Speakers(30-220W, 3-8Ohms), DC 16-38V, BT USB AUX Input

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Photo 1 of Bluetooth 5.1 Audio Amplifier Board, ZK-AS21 2.1 CH 220W x 2 + 350W HiFi Subwoofer Power Amp Mini Digital Audio Amp Module for Home Speakers(30-220W, 3-8Ohms), DC 16-38V, BT USB AUX InputPhoto 2 of Bluetooth 5.1 Audio Amplifier Board, ZK-AS21 2.1 CH 220W x 2 + 350W HiFi Subwoofer Power Amp Mini Digital Audio Amp Module for Home Speakers(30-220W, 3-8Ohms), DC 16-38V, BT USB AUX InputPhoto 3 of Bluetooth 5.1 Audio Amplifier Board, ZK-AS21 2.1 CH 220W x 2 + 350W HiFi Subwoofer Power Amp Mini Digital Audio Amp Module for Home Speakers(30-220W, 3-8Ohms), DC 16-38V, BT USB AUX Input