It can work with one battery or two batteries, and it can last longer time with two battery, This item does not include batteries.

Item description:
This mini speaker supports Micro SD/TF card, USB disk, FM, it is stylish, compact, portable and convenient to carry. With it you can enjoy music anytime anywhere.
1. How to charge: connect the USB cable to a phone charger or computer and then it will get charged;
2. How to use the FM radio: switch to the FM mode and long press the play key, it will search the radio station and save it automatically, only the first time you use it need to search the radio station.
3. How to play music in the sd card or usb disk: insert a sd card or a usb disk and it will play it automatically, this device can insert two sd card.