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
Sennheiser PXC 550 II Wireless Active Noise-Canceling Headphones-brand new 615104320048 | eBay