Small but multi-functional: With this portable speaker, you can enjoy the charts from Capital Bra to KC Rebell, whether you're hanging out in the park or taking a quick dance break. With the "Cube," you set the tone. If you have two of them, you can even enjoy stereo sound! True Wireless Stereo transforms mono into stereo: connect two speakers via Bluetooth and place them freely in the room for authentic stereo sound. Direct MP3 audio playback is possible through the integrated micro-SD card slot. Full mobility thanks to battery operation: the battery can be charged via a USB cable. Quick charging within 3 hours. With the built-in hands-free function, you can easily make HD-quality phone calls.