Small and ergonomic, with a stable and secure fit. BT 5.3, stable transmission with low power consumption, instantaneous audio and picture synchronization. Dynamic speaker with bio-fiber diaphragm, HiFi super bass quality. Noise is instantly blocked by in-ear passive noise cancellation technology as soon as the earbuds are put on. Quick connection after removing the earbuds, smooth transition between single and double earbuds, and dual main earbud mode. When using a charging case, the playback time of a single earbud can reach up to 48 hours.