With two powerful 16.2 mm dynamic drivers that are three times the size of other earphones, our open headphones offer a rich listening experience. Two microphones in both earphones with ambient noise cancelling function that work efficiently to reduce ambient noise around you and ensure that your voice is heard clearly during phone calls. The latest Bluetooth 5.3 creates a comprehensive upgrade that optimises Bluetooth transmission and connection errors. And it is easy to pair, when removed from the charging case, the wireless Bluetooth headset will automatically connect to the previously paired device (after the 1st successful pairing). Widely compatible with most Bluetooth enabled devices, including iPhone or Android or Windows products, iPad, TV, computer, etc.