Question about Sennheiser Pxc 550

1) The microphones are in the earpieces. I do not know exactly where, but it is not important. I have made telephone conversations using the headset with no problem. The other party was satisfied with the voice quality.
2) My PC has no bluetooth. I use a Plantronics BT600 dongle. Pairing OK. Quality OK. I also have a Hama aptx Bluetooth transmittter from my Home Cinema. Best quality (without aptx) is from my Nexus 6 phone and Samsung tablet.
+Good quality headphones with lots of functionality
+Noise cancelling
-Expensive
-Earpieces are somewhat small. My ears are large and I must fold them inside the casing otherwise they are on-ear instead of over-ear headphones. Try before buy
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1. is the headset controllable on the pc via the pc's own sound card (generating souround) or does the PXC 550 have an integrated sound card?
2. how is the microphone when talking (for example in ts)?

Is the unit on display in the Zurich showroom?

1. the headset has three microphones. 2 on top outside the ear cups and one on the front right ear cup. Looks like a small flower 🌺

2. can be connected to the computer without any problems if you buy an additional dongle or if your PC has a BT module.

Absolutely recommended to buy. I have loved these headphones since the first time I wore them.