Features:Sound quality is very good by using this module.Equipped with AUX interface.Using CSR8635 Bluetooth chip, Bluetooth V4.0, high software compatibility.After power on, automatically enter into pairing mode, search the name: SANWU Audio.With 5 buttons for adjustment, convenient and easy operation.Applicable speaker impedance: 4/6/8/16 ohm (8 ohm is the best).