Bluetooth headphones adopts a completely open design, and the earbuds can be gently and firmly placed on the top of the ear. Unlike traditional wireless earbuds, open-ear earphones do not need to be placed in the ear canal, even if you listen to music all day long, your ears will not feel sore, and it can prevent damage to your ears. Using the most advanced Bluetooth 5.3 technology. Built-in Bluetooth chip for noise and echo cancellation. Audio processor with DSP for bass sound. Open the cordless earbuds charging case they'll automatically connect to the last paired device. By touching either wireless bluetooth earbuds to answer/hang up the phone, play/pause, previous song/next song , volume up/down, and access to other functions, the operation is very simple and convenient.