Battery suitable for Sennheiser PXC 550 - 650 mAh 3.7 V battery (Black) - BatteryUpgrade
Sennheiser PXC 550 Wireless Circumaural Over Ear Bluetooth Headphones – JG Superstore
Buy SENNHEISER PXC 550-II Wireless NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life, Black Online at Lowest Price in Ubuy Hong Kong. B07ZPQQCVX