24-Hour Playtime: A single charge delivers days of listening. And when you?re in a rush, recharge Life U2 neckband Bluetooth headphones via USB-C for 5 minutes and enjoy 2 hours of playtime. High-Quality Sound: 10 mm drivers (20% larger than ordinary earphones) have a bio-cellulose diaphragm to produce high-detail treble with superior clarity. Switch on BassUp mode for up to 70% more bass. Clear Calls with cVc 8.0 Noise Reduction Technology: Your voice is picked up and enhanced while background noise is effectively suppressed to ensure you?re heard in exceptional clarity even if you?re in a noisy environment. Ergonomic 3D Comfort: Life U2 neckband Bluetooth headphones have a lightweight silicone neckband with a titanium alloy steel core to ensure a snug fit on your shoulders and superior shape retention. IPX7 Waterproof: A waterproof casing protects Life U2 neckband Bluetooth headphones against rain, water, and more.