True HD High Fidelity Sound: Update Bluetooth Headphones own latest Bluetooth 5.3 technology and IMPROVE acoustic components that produce incredible sound quality with deep bass and crystal clear treble.Also we have upgraded the bluetooth name from "Otium" to "U18", it will more conveniently to search and connect with the headphones. | IPX7 Waterproof Rating: With ergonomic design and silicone ear hooks, wireless headphones secure stay on your ears, feel great to wear and will never fall out. Upgraded Waterproof Rating, 100% prevents ordinary splashing water and rain. | Longest Battery Life: The new improved lithium polymer battery allows seamless enjoyment of music for up to 16 hours and 240 hours stand-by with a charge of only 1.5 hours. Neckband design prevents troublesome wires from tangling during your workout. | Sound Isolation Technology: Connect seamlessly with all Bluetooth enabled devices up to 30 feet （10m） away. With Noise Suppression Technology reduce background noise. So you can focus on your favorite music, no matter where you are. | Foolproof Operation: Allows Skip/Play/Pause on your music tracks as well as all phone use without reaching your phone.