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![Amazon.com: 4 Channel Bluetooth Amplifier, 50W x 4 Audio Power Amp, Hi-Fi Home Stereo Speaker Receiver [Douk Audio M4] : Electronics](https://m.media-amazon.com/images/I/31MHtfvF-8L.jpg "Amazon.com: 4 Channel Bluetooth Amplifier, 50W x 4 Audio Power Amp, Hi-Fi Home Stereo Speaker Receiver [Douk Audio M4] : Electronics")