Can these headphones connect to 2 devices at the same time just like the Bose QC35's?

Yes. The headphones can be paired to 2 active devices at the same time. (It can remember up to 8 devices in memory). My headphones automatically switch between laptop high fidelity audio vs iPhone depending on which devices is outputting sound. (When pairing on with PC make sure to pair the stereo headset device for high fidelity audio)

Whats the difference between these momentum 2.0 bluetooth? same price point. why choose one over the other?

TL;DR - I'm selling my HD1s (Momentum) and going back to PXC 550. I had a much older PXC 550 model which I LOVED and travelled with for several years. I needed to replace them so I opted for the HD1, which is the precursor to the Momentum. I wanted to love these headphones - they look beautiful, they sound beautiful, they are awesome for both calls and music - BUT they are SO UNCOMFORTABLE. I cannot wear them for more than maybe 30 minutes at a time before my ears are killing me. They don't actually go around my ear, they are too small so they sit on top a bit, which squishes my ear against my head. This would be OK if they were actually on-ear headphones, but they're not, they're very heavy and tight against your head. If you are looking for comfort, the PXC 550s are the way to go without compromising the sound quality.

Hello! how do you compare pxc 550 with mdr 1000x from sony???

I bought the 550 and returned it for the Sony 1000xm2. The 550 has better noise isolation, but was really underwhelmed by the audio quality. Both cancel out the white noise but the 550 seemed to block out voices much better, which may simply mean it has a better seal on my head. But the audio quality was very inferior to my ears. I own the Sony MDR-1A, and the 1000xm2 isn't quite as good as those wired cans, but they are a lot better than the 550's. That coupled with the clunky app for the 550's made me switch. The Sony isn't perfect, it still beeps at me randomly every so often and I haven't figured out how to make that stop. It is only every 20 minutes or so, so I live with it.

Noise Control	Active Noise Cancellation
Headphones Jack	Wireless
Model Name	PXC 550-II
Connectivity Technology	Bluetooth, Wired
Wireless Communication Technology	Bluetooth
Included Components	PXC 550-II headphones, Carry case, USB charging cable (USB-A to Micro-USB), Audio cable, Flight adapter
Age Range (Description)	Adult
Material	Plastic
Specific Uses For Product	Professional, Travel
Charging Time	30 Hours
Compatible Devices	Smartphones, Tablets, Smart Speakers, Desktops, Laptops, Televisions, Car Audio Systems
Control Type	Voice Control
Cable Feature	Tangle Free
Item Weight	227 Grams
Water Resistance Level	Not Water Resistant
Net Quantity	1 Count
Style	New Model
Control Method	Touch
Number of Items	1
Battery Life	30 Hours
Audio Driver Type	Dynamic Driver
Earpiece Shape	Over Ear
Series number	508337
Hardware Interface	Bluetooth 5
UPC	615104320048
Supports Bluetooth Technology	Yes
Special Feature	Noise Cancellation
Manufacturer	SENN9
Model	508337
Model Year	2019
Product Dimensions	6.1 x 13.46 x 17.27 cm; 227 g
Batteries	1 Lithium Polymer batteries required. (included)
Item model number	508337
Special Features	Noise Cancellation
Microphone format	with microphone
Microphone technology	Unidirectional
Speaker connectivity	Wireless
Power Source	Battery
Batteries Included	Yes
Batteries Required	No
Battery cell composition	Lithium
Cable feature	Tangle Free
Does it contain liquid?	No
Includes Rechargeable Battery	Yes
Item Weight	227 g

Consumer Audio PXC 550-II Wireless Bluetooth Over The Ear Headphone with Mic (Black)

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