Check the listing for details. Bluetooth 5.4 Wireless Open-Ear Headphones Ergonomic Ear Hook Waterproof Earbuds. Color: Black, Condition: New. Listed at 12.99 USD. Feature: 1: Dual-axis adjustment, with horizontal + vertical dual-axis design, you can adjust the angle of the earphones in the horizontal and vertical directions according to your personal preferences and usage needs. Unlike the traditional fixed design, the dual-axis design provides greater flexibility and freedom. Whether it is large or small ears or people with different head shapes, they can get the right wearing experience and sound quality performance. 2: It can be used for about 5 hours at a time, and the charging case can provide an additional three times, with a total battery life of 20 hours 3: Bluetooth 5.4 technology, precise touch operation, faster response, stable transmission .