Question 1

Where can I get another aux cable?

Accepted Answer

On Amazon.
 I recommend the marshall  aux
 it has a great microphone and it has a coil which makes it very comfortable to be walking around without it getting caught on stuff or just not feeling like u have too much cable when working on a laptop.

Question 2

Is this recommended to use for online conferencing? is mic quality good?

Accepted Answer

Yes. I have used it for about 10 days for teams/zoom meetings, the mic and speaker work very well for me.

Question 3

Do they have transparent mode like more expensive models? And if not, is it possible to be reasonably aware of the surroundings when using them?

Accepted Answer

Answer to @ShakyJake, you mentioned that you are unable to turn it off the "Transparency Mode" or the pass-through sounds that are made ambiently around you, like voices, crinkling paper, and typing. This is not the same as ANC(Active Noice Cancellation) which removes only the ambient hum of the room like a fan, refrigerator, or airplane.

This particular headset actually has two BlueTooth Connections or "drivers" on windows and mac. 
"Headphones (LE-HD 450BT Stereo)" & "Headset (HD 450BT Hands-Free AG Audio)"
Mobile devices seem to auto-switch between these depending on if they are utilizing the mic in the Headset or not.

Headphones (LE-HD 450BT Stereo): Does not utilize Transparency Mode, however ANC can be toggled. (Set this as "Default" if you do not want to here the Transparency mode)
Headset (HD 450BT Hands-Free AG Audio): Seems to default Transparency Mode ON, and ANC can also be toggled when this is active as well. (If you make a lot of calls and utilize the mic setting this to "Default" may be more useful) If you use the Assistant button, this will automatically switch to this driver, but will revert if you have the headphones selected as "Default".

**Extra Notes**
If you have a 5.0 BlueTooth (internal or as an adapter) for your computer both of these are able to connect and you can toggle between these in your sound settings. Most modern mobile devices as of July 2016+ have this installed but you may use the AIDA64 app on the Google Play store to see if it's in your device.
Apple Users: iPhone 8, iPhone 8 Plus, iPhone X, HomePod, and the 2018 MacBook Pro with Touch Bar all (and newer devices) utilize the 5.0 or newer BlueTooth.
I do not know what happens if you have an older version of BlueTooth, however, I speculate that switching between the two drivers may be clunky, and slower than it already is. However they will still connect, you may just run into issues connecting other devices simultaneously like a mouse and keyboard.
The S 450BT WILL usually prioritize headphone mode, however, I hope this helps if you were confused.
If you use the Headphone Jack it will put the headphones in Flight Mode and deactivate all BlueTooth Connections.

Hope this helps!

Question 4

Do the headphones come with a charger or do I need to buy one separately?

Accepted Answer

The headphones come with usb cable for charging, but no adaptor.

Controller Type	Voice Control
Control Method	App
Control Type	Voice Control
Compatible Devices	Cellphones
Antenna Location	Calling
Enclosure Material	high-quality materials, Leather
Water Resistance Level	Not Water Resistant
Is Electric	No
Specific Uses For Product	Travel
Cable Features	Without Cable, Detachable
Additional Features	Foldable, Fast Charging, Microphone Included
Earpiece Shape	Around Ear
Headphones Ear Placement	Over Ear
Headphone Folding Features	Over Ear
Frequency Range	18 Hz to 22,000 Hz
Frequency Response	28000 Hz
Impedance	14 Ohm
Noise Control	Active Noise Cancellation
Audio Driver Type	Dynamic Driver
Item Weight	0.24 Kilograms
Unit Count	1.0 Count
Connectivity Technology	Wireless, Wired
Wireless Technology	Bluetooth
Bluetooth Version	5.0
Headphone Jack	usb
Carrying Case Color	White
Color	Black
Style Name	Original
Theme	Video Game
Battery Average Life	30 Hours
Battery Charge Time	2 Hours

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Sennheiser Consumer AudioHD 450BT Bluetooth 5.0 Wireless Headphone with Active Noise Cancellation - 30-Hour Battery Life, USB-C Fast Charging, Virtual Assistant Button, Foldable - Black

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