Using a new generation of Bluetooth 5.3 chip, lower power consumption and more stable Automatically turn on and pair when the cover is opened, and automatically shut down when the charging box is closed. It supports master-slave switching, up-down switching, calling Siri, binaural calls, and pressure-sensitive operation functions EW20 simplified version , cancel the long-press button to clear the pairing function, reduce the cost and optimize the price.