Sennheiser MM 550-X Travelling Headset Review - Active Noise Cancellation, SRS, BT and TalkThrough | Technology X
Amazon.com: Sennheiser PXC 550 Wireless – NoiseGard Adaptive Noise Cancelling, Bluetooth Headphone with Touch Sensitive Control and 30-Hour Battery Life : Electronics
Sennheiser PXC 550-II Wireless headphones features Smart Pause to react to your movements » Gadget Flow
boAt Rockerz 550 Bluetooth Wireless Over Ear Headphones with Upto 20 Hours Playback, 50MM Drivers, Soft Padded Ear Cushions and Physical Noise Isolation with Mic (Black Symphony) : Amazon.in: Electronics