Sennheiser MOMENTUM 4 Wireless Headphones - 80th Anniversary EditionA dramatic update and upgrade over the previous generation, the black MOMENTUM 4 Noise Canceling Wireless Over Ear Headphones from Sennheiser trades in the classic design and folding body for a sleeker, more modern look and fold flat earcups. More importantly, the battery life has drastically improved by nearly four times to up to 60 hours with both Bluetooth and adaptive noise cancellation on. Audio quality is still on the high end with Sennheiser's