Bose QuietComfort 35 (Series I) Wireless Headphones, Noise Cancelling - Silver World-class noise cancellation makes quiet sound quieter and music sound better.Connectivity Technology: Wireless Volume-optimized EQ for balanced audio performance at any volume Wireless convenience, with easy Bluetooth and NFC pairing aided by voice prompts 20-hour battery life per charge; up to 40 hours in wired mode Noise-rejecting dual-microphone system for clear calls even in windy environments; Headphones:18 cm H x 17 cm W x 8.1 cm D (0.52 lb/234 g)