Features:Upgrade BT technology, wireless 10m transmission, compatible with most of BT devices.Micro SD card slot for larger storage space of music from an alternate source.Built-in FM radio module, it can automatically search and store radio stations.Stylish design and convenient hanging ring.HiFi stereo speaker, powerful natural sound brings music to your life.Built-in 2000mAh rechargeable battery offers up to 8 hours of music playbackCompatible with almost of BT-enabled devices.