The Btootos A90 Pro True Wireless Earbuds in black are designed for sports and running, featuring a sleek in-ear form factor and Bluetooth wireless technology for convenient connectivity. With a frequency range of 2.4-2.48, these earbuds are suitable for studio monitoring, DJ, and live monitoring. The wireless charging feature adds to the modern design of these earbuds, making them a practical choice for on-the-go use. Made by InEar, these earbuds offer a comfortable and secure fit for all-day wear.