This high-quality battery is designed for use with a range of multimedia devices including MP3 players and MP4 players. With a voltage of 3.7V and an impressive capacity of 550mAh, this battery is ideal for use with a variety of devices that require reliable and long-lasting power. Whether you need a replacement battery or simply want to keep a spare on hand, this battery is an excellent choice. It's compatible with a wide range of devices and is designed to provide consistent performance over time. Invest in this high-quality battery today and enjoy reliable power for all your multimedia devices!