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Sound quality is very good by using this module. Using CSR8635 Bluetooth chip, Bluetooth V4.0, high software compatibility. Power amplifier chip: TDA7492 double channels sufficient power 50W, better than TDA7492P. With microphone (can call with Bluetooth), AUX interface(wired mode audio input). With 5 buttons for adjustment, convenient and easy operation.Applicable speaker impedance: 4/6/8/16 ohm (8 ohm is the best).