High- and low-frequency sound is delivered directly to your ear without any interference thanks to PRIMO's unique coaxial dual driver technology. Its expansive soundstage is roomy and intricate. Customized Noise Cancelling: Conventional noise cancellation merely modifies noise according to information. By analyzing your ears and in-ear pressure, HearID ANC generates a customized profile that minimizes outside noise and maximizes noise reduction for your ears. Combination Comfortable Fit: For all-day comfort, PRIMO earbuds feature an integrated ear pressure relief system and a triple-point ergonomic design. Flexible ear wings and four sizes of liquid silicone ear tips guarantee a tight fit and a firm seal. Rapid Recharge Ten minutes Play for an hour. 13 hours or more. Version 5.0 of the Play Time Touch Control Bluetooth