Bluetooth 5.4 technology enables faster connection and higher response frequency. The case charges the earphones automatically when closed, and pairing is quick and seamless as soon as the case is opened. Includes two pairs of earphones for continuous use, providing up to 24 hours of listening time so you do not have to worry about battery life. Independent connection option allows each earphone to connect to different signals without interference, or to connect simultaneously to the same signal to deliver stereo sound when used together. LED display shows battery levels for both the headphones and the charging case with bright color indicators for easy ataglance status. Compatibility and setup: works with Bluetooth enabled devices; straightforward pairing for quick use. Use scenarios Daily commuting or workouts: pair with your phone for calls and music, with fast pickup when you open the case and continuous use from the two earphone sets. Multidevice use at home or in the office: connect one earphone to a laptop and the other to a phone for independent audio, or use both together for immersive stereo sound on a single device. Shared listening and flexibility: when two people want to listen to the same content, pair both earphones to the same device for synchronized stereo output, or connect to different devices as needed.