Wireless Bluetooth Speaker with Rechargeable Battery. It is compatible with laptops, MP3/4 devices, TF/USB Flash Drive, or any audio device that is Bluetooth compatible or has a 3.5mm jack input. With the Bluetooth, it sends good interference less performance, high data rate, and efficiency. It comes with a built-in FM Radio to listen to your favorite radio stations (To play Radio Stations 1. Insert mini USB Cable in device 2. Select radio mode 3. Gently press play/ pause button, 4. Wait for a minute 5. Change radio station using next/ previous buttons) and with the rechargeable Lithium battery included, you can have up to 6 hours of playing time. Did we mention it comes with a built-in microphone. The microphone will allow you to make and receive Handfree calls and listen to the other person loud through the speaker. If you are playing your music and a phone comes in, the music will stop and you will hear your phone ring and will continue playing after your phone has ended. FM USD/ SD player phone attending option.