Sennheiser PXC 300 NoiseGard™ noise compensation headphones at Crutchfield
Sennheiser PXC 250 NoiseGard™ noise-compensation headphones at Crutchfield
Amazon.com: Sennheiser PXC 250 Active Noise Canceling Headphones (Discontinued by Manufacturer) : Sennheiser: Electronics
Amazon.com: Sennheiser CXC 700 Ear-Canal Travel Headphones with 3 Digital Noise Cancellation Settings : Everything Else
Sennheiser HMEC 250 - Headset for General Aviation - Pilot Headset - excellent speech transmission - Active noise cancelling, Talk-Through function
Amazon.com: Sennheiser PXC 550 Wireless – NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life : Electronics
Amazon.com: SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black : Electronics