1. Bluetooth 5.1: Bluetooth 5.1 technology ensures a stable connection and helps reduce energy consumption. 2. Power bank function: Thanks to the high - efficiency battery, the charging case can act as a power bank. Just insert the earphones to charge them without a power supply! Moreover, it can charge the earphones several times! The integrated display clearly shows the charging status of the earphones. 3. Noise cancellation: The noise - cancellation technology ensures high - quality sound in any environment. 4. Powerful bass and clear treble: These earphones are designed for the most demanding users, so they offer the best sound quality. 5. Wide compatibility: These earphones can be connected to all Bluetooth - enabled devices (including mobile phones, laptops, and TVs).