2. Support TF card playback design. Save your favorite music to your card and listen to it even when you go out without your phone 3. Chip upgrade, new version of Bluetooth 5.4. Adopting the newly upgraded 5.4 version Bluetooth chip, it has higher compatibility, faster and more stable data transmission. 4. Ear hanging style, comfortable as ever. The ergonomic curve design of the earphones fits snugly against the earlobe, providing you with a lightweight and comfortable wearing experience that is not easily dislodged during sports. 5. 180 ° rotation, can be worn on both left and right ears. 180 ° rotation, easy switching between left and right ears, allowing for more freedom and flexibility in wearing to meet various usage needs. 6. LED digital power display. Adopting high-definition LED digital display, the headphone battery level is clear at a glance.