The Vomelon headphones get extremely loud. As for sound quality they have a somewhat week lows, laid back mids and smooth highs. Even at high volumes their is minimal distortion. These headphones should make for great sport headphones or for listening to audio books. The sound is non fatiguing even after hours of listening. They are rated for five hours of playback but I consistently got six or more. Thanks to the small 100mAh battery, charging times were as quick as 30 minutes with a 2A charger. Using the headphones for calls worked very well and I had no complaints from the person at the other end of the call.
Overall these are great Bluetooth headphones. They sound decent, have great battery life, and are comfortable. If you are interested in purchasing these headphones they can be found here.