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View 1 of 2.1 Channel Bluetooth HiFi Stereo Subwoofer Amplifier, RMS 20Wx2+40W Mini Digital Audio Power Amplifier & Bass Treble Control for Home Speakers, 80W Amplifier Audio Stereo Bass Amp with Power Supply.View 2 of 2.1 Channel Bluetooth HiFi Stereo Subwoofer Amplifier, RMS 20Wx2+40W Mini Digital Audio Power Amplifier & Bass Treble Control for Home Speakers, 80W Amplifier Audio Stereo Bass Amp with Power Supply.