Most portable speakers have a built-in rechargeable battery, but if you want to freely change battery for longer playback time, the following Rocksteady XS portable speaker may be more suitable for you.
Rocksteady XS is a portable stereo speaker system that measures 6.5 x 2 x 2 inches. As we can see from the images, the portable speaker features low-profile, compact design, using built-in Bluetooth 3.0 technology, the stereo speaker allows to wirelessly connect with your smartphone or any Bluetooth-equipped music player for music playback, and its replaceable rechargeable battery offers over 10 hours of playback time. Similar with other wireless speakers, Rocksteady XS also has a built-in 3.5mm audio input for other music players. The difference is that the Bluetooth speaker also features a standard USB port that allows it to play MP3 files from your USB drive.
Rocksteady XS portable wireless speaker is priced at $99.99 USD, and will be available soon. If you’re interested, jump to Killer Concepts official site for more details. Additionally, if you need other options, you might like to check boomBOTTLE wireless speaker and more via “wireless speaker” tag.