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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
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bluetooth 4.0 Audio Receiver Module DC 7V-30V CSR8645 For DIY Speaker
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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
