They connect via Bluetooth 5.3 which provides a very stable wireless connection and quick pairing. The headphones boast a impressive 90 hours of total battery life - 15 hours per charge for the headphones themselves and an additional 5 full charges from the included 650mAh charging case. Other key features include: ENC noise cancelling technology to block ambient sounds 14.2mm speaker drivers for HiFi stereo sound IP7 waterproof rating Ergonomic design with adjustable earhooks and 3 sizes of ear tips Built-in microphone for taking calls LED battery level indicators on both earbuds and charging case Button controls for volume, calls, and voice assistants USB-C charging Design and Build Quality NWOT *Ltinist BX29 Wireless Earbuds (Never used.) Color: Rose Gold Design: The foldable design box makes them easy to transport. NWOT * The adjustable earhooks are flexible. The earbud tips come in 3 sizes (included) Charge: Type-C (included) $45+tax &shipping new ***images in black are for information & detail viewing only****