Amazon.com: SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black : Electronics
Sennheiser PXC 550 Review. Best Wireless Noise-Cancelling Headphones? – Headphones.com
Sennheiser Introduces PXC 550 Wireless Noise Cancelling Headphones with up to 30 Hours Battery | audioXpress
700mAh Battery for Sennheiser PXC 550,AHB413645PCT
New 700mAh Li-Ploymer AHB413645PCT Replacement Battery For Sennheiser PXC 550 Accumulator Batterie 3-wire Plug +tools
Amazon.com: SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black : Electronics
Amazon.com: Replacement Battery for Sennheiser MM 400 PXC 310 BT PX 310 BT MM-550-X 0121147748 BA 370 PX BA370 BA-370PX (270mAh) : Health & Household