(The silicone EarWings on the earbuds guarantee that they will stay firmly in your ears.) 2. Two Custom Sound Modes (Classic mode + Bass boost) 3. Playtime of 28 hours (8 hours on a single charge, 28 hours with the charging case) 4. IPX5 Waterproof (the earbuds are shielded from perspiration during exercise, unexpected downpours, and spilled beverages) 5. Easy to Carry (you never have to worry about space because it's small enough to fit in your pocket or clip onto your bag or keys). 6. AI-Enhanced Clear Calls: Your voice will always be heard clearly during calls thanks to an AI algorithm and two built-in microphones. 7. Low latency technology (sound and image synchronization, low latency of 65 ms) 8. When the charging case is opened, BT 5.4 automatically reconnects (stronger signal, less loss and delay).