COWIN E7 Ace • You only hear music. Professional active noise cancellation effectively adapts to ambient sounds. • Listen all week. 30 hours of playtime on a single charge and just 10 minutes of charging provide over 1 hour of playtime. • Bluetooth Basics. 45 mm long drivers with high bass dynamics. • Designed for comfort. Our ear cushions are ergonomic and protein-infused, and the ear cups rotate at a 90° angle. • No interruptions. The Bluetooth 4.1 CSR8635 system offers greater range with fewer dropouts than all previous Cowin models. • Speak easily. The built-in microphone, optimized for voice calls, makes hands-free calling simple. • You have full control: pause, play, skip, and adjust the volume with the buttons on the headphones. • Pack and listen at the same time; music is always with you.