Bluetooth 5.3: The wireless earbuds adopt Bluetooth 5.3 technology and support HSP, HFP, A2DP, AVRCP, AAC, it greatly enhances the signal transmission and connection stability of ear buds bluetooth. Hi-Fi Stereo: These wireless headphones feature a 13mm speaker and a triple-layer composite diaphragm, adopted with AAC/SBC audio coding technology, to provide strong bass, crisp highs, and precise mids. IP7 Waterproof: The waterproof sport earbuds feature an IP7 nano-coating, can effectively prevent the earbuds from damage of sweat and slight raindrops.Fast Charging: Bluetooth earphones provide up to 8 hours playtime on a single 1h USB-C fast charge, giving a total playtime of 40h. If earbuds are low on power, a quick 10-minute charge will give 2 hours playtime.One-Step Pairing:After the first setup, these wireless earphones will connect with your device once you open the charging case, which is faster and more convenient. Universal Compatibility:In ear wireless headphones is compatible with most Bluetooth devices, including iOS, Android, PC and more.