Enjoy quality listening with stylish speakers from well-known companies A4tech. Small, portable speaker BTS-08 with built-in high-quality audio converter provides you with a surprisingly loud sound quality. Connection to audio sources can be wirelessly or from a Micro SD memory card, or the Aux input so you can listen to your favorite music and reproduce anywhere you please. Built-in Li-Ion battery can be recharged via USB and rugged devices are required controls, including a microphone for hands-free calls.