Wireless earphones use Bluetooth technology to establish a wireless connection with audio sources such as smartphones, tablets, laptops, and music players. Bluetooth allows for seamless pairing and wireless audio streaming over short distances.Each earbud is equipped with a built-in rechargeable battery, which powers the speaker drivers and Bluetooth connectivity. The battery life varies depending on the model and usage but typically ranges from a few hours to several hours of continuous playback on a single charge.