1. Comfortable Ergonomic Design: The wireless sports headphones have an ergonomic ear hook design and the design of the sponge covers of the earbuds provides a secure fit that aims to fully fit your ears without falling out even during intense workouts. They always stay in position for comfort and stability when moving.^ 2. Built-in memory card function: The independently loadable memory card corresponds to an MP3 headset. Avoid carrying your mobile phone in your pocket while exercising. (Note: The memory card is not included in the scope of delivery^ 3. Long working time: 6 hours of continuous playback / 7 hours of talk time with a 3 hour quick charge. Do not worry about the lack of electricity when you are playing sports.^ 4. Lightweight and Foldable: This headset with foldable and lightweight design almost fits head sizes. Portable and foldable are more convenient without taking up a lot of space for storage.^