Okay but depending on the mobile the music can be high or very low due to load impedance.,
Verified Purchase(What is this?)
This review is from: Philips SHQ4200/10 ActionFit Washable Ultra Light Sports Headphones - Neckband (New for 2013) (Electronics)
Found the head okay in most of my phones but not too loud in my Sony MP3, this could be down to load impedance.
Only real critic is when you sit down on a chair with a headrest the back of your head touches the chair and forces the headset to move away from your ears. Great for exercise but not to relax with.