Loudest and Clearest No matter how you listen to music, the Rock steady XS is the perfect tool. The Rock steady XS is the clearest and loudest Bluetooth Portable Speaker in its class. Nothing matches its versatility, performance or sound. Don't let the plain design fool you: You hear in stereo when each ear hears a different track. The main speaker are side facing, and the top speaker is a subwoofer; delivering a true and rich stereo 2.1 sound that you have to hear to believe. The hard aluminum shell makes the Rock steady XS extremely durable. It also is the secret to our superior sound. Distortion comes when sound waves are distorted, and those waves are delivered cleanly to your ears thanks to the hard metal case. The Rock steady XS is made of an all-aluminum frame which is light weight and eliminates distortion. Party Mode allows you to connect two devices to your Rock steady XS wirelessly at the same time. The battery is designed to last all day (or all night), over 10 hours per charge. Only the Rock steady XS allows its owners the ability to swap-out the Lithium-Ion battery with another, extending your use to all day and all night. Play or pause your songs, skip to the next track, or answer a phone call, all this can be done directly from the speaker, even to control music apps. Built to use, and built to last. The only compromise is the price your pay. Guaranteed to connect to your Smartphone or Tablet. Features• Loud and clear - up to 100 dB, distortion free up until its limits.• Only true 2.1 stereo surround sound speaker in its class.• 10 hour battery life per charge, and industry only swappable battery solution.• Guaranteed to connect to your Smartphone or Tablet.• USB Port to play MP3 files directly from a USB Drive.• Bluetooth memory of the last 4 devices paired, for easy reconnections.• Built in Speakerphone.• All cables and chargers included.• 1 year warranty - with the industry's best service.