I have the JAY-tech Mini Bass Cube SA101BT Mini Speakers by chance in K .... gesehehen. A small box with Bluetooth. Bluetooth - the ideal connection to mobile phones, such as iPhone or other smartphones. Works instantly and without problems. The songs to be played can be controlled excellently on the smartphone. The volume can be controlled very well at smartphone. The sound is excellent. Ideal for traveling. The battery lasts in normal use approximately 5 hours. That's OK. My recommendation for this little box.