JLab FIT SPORT IN EAR WIRELESS BLACK are wireless earphones with an in-ear design and a built-in microphone. They are designed for sports and fitness activities, and feature a secure fit and a water-resistant construction. The earphones have a battery life of up to 8 hours, and can be charged using the included USB cable. They come with a variety of ear tips and fins to ensure a comfortable fit, and also feature an adjustable tip placement for optimal sound quality. The earphones have three EQ settings, allowing you to customize the sound to your preference.