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-free performance, high data rate, high quality and efficiency. It comes with a Built-In FM Radio to listen to your favourite radio stations 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 Hands-free calls and listen to the other person loud through the speaker. If you are playing your music and a call comes in, the music will stop and you will hear your phone ring and will continue playing after your call has ended. There are four colors available for you to choose. Color: White, Red, Blue, Orange.