With powerful 40mm drivers and exceptional acoustics, Hesh Evo features audio quality that has been refined over four generations of constant improvement. The clear, rich sound rivals the most expensive headphones out there — at a price that’s surprisingly affordable. Noise Isolating Fit With powerful 40mm drivers and exceptional acoustics, Hesh Evo features audio quality that has been refined over four generations of constant improvement. Call, Track and Volume Control The clear, rich sound rivals the most expensive headphones out there — at a price that’s surprisingly affordable. Bluetooth Wireless Technology Up to 36 Hours of Battery with Rapid Charge.