I'm not happy this time with tecevo S4 sports Bluetooth 4.1 wireless headphones because because I found quite difficult to use so is not a well designed because when I wear 2 or 3 hours are found pain in my ear and is not value for the money.
I was sceptical when buying being they were so Cheap, but can't believe how great they are. They handle top volume and base with no distortion or crackles. Dont waste your money on top end ones and buy these.A GENUINE bargain