It"s small and convenient size gives you ultimate portability without the wires! Divoom Blue tune Solo Version 3 Wireless Bluetooth Speaker has been improved in so many ways from the overall sound quality experience to adding a volume control button. The Divoom Blue tune Solo"s X-bass sound system features patented PO-Bass Technology that provides a deep bass in a compact package, and includes a built-in microphone for hands-free calls. Picture yourself at the park having your phone safely hidden away while you listen to your music and still be able to answer phone calls all from your blue tune-solo. Other Blue tune Solo product features are the latest 4.0 Bluetooth technology for high-quality streaming, portable Bluetooth speakers can stream from an iPhone, iPad, or any smart phone or tablet, each speaker is equipped with a single cable for battery charging and auxiliary input and a built-in rechargeable battery for up to 8 hours of playback.