Bluesound BP100 battery for Flex 2i

Accessory BP100 battery for PULSE FLEX speaker. Place the BP100 batteries on the back of the PULSE FLEX, which allows you to listen to the device for six hours.
 
Stream audio content via aptX® Bluetooth, WiFi, or connect the device to the optical input
The battery pack contains eight rechargeable AA batteries
One charge allows six hours of listening to music
Battery charge indicator via BluOS app
In black or white, matching the PULSE FLEX color
Pulse Flex sold separately