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.

ASIN	B09325WTV5
Additional Features	Amazon Alexa
Age Range Description	Adult
Antenna Location	Versatile, suitable for various uses
Audio Driver Type	Dynamic Driver
Battery Average Life	30 hours
Battery Charge Time	30 hours
Best Sellers Rank	#58,982 in Electronics ( See Top 100 in Electronics ) #1,040 in Over-Ear Headphones
Bluetooth Range	10 Meters
Bluetooth Version	5.0
Bluetooth support?	Yes
Brand	Sennheiser
Built-In Media	Cable, HD 450BT Wireless Headphones, Protective Case, USB-C Charging Cable
Cable Features	Without Cable
Carrying Case Battery Charging Time	30 Hours
Carrying Case Color	Black
Carrying Case Material	fabric
Color	Black/White
Colour	Black/White
Compatible Devices	Smartphones, Laptops, Tablets, Smart Speakers, Desktops
Connectivity Technology	Wireless
Control Method	Voice
Control Type	Call Control
Controller Type	Call Control
Customer Package Type	FFP
Customer Reviews	4.0 out of 5 stars 2,539 Reviews
Ear placement	Over Ear
Earpiece Shape	Over-ear
Enclosure Material	Plastic
Form factor	Over Ear
Frequency Range	18 - 22,000 Hz
Frequency Response	6000 Hz
Generation	1
Hardware Interface	Bluetooth
Headphone Folding Features	Over Ear
Headphone Jack	USB
Headphones Ear Placement	Over Ear
Impedance	60 Ohms
Input-Device Interface	Bluetooth
Is Autographed	No
Is Electric	Yes
Item Weight	0.52 Kilograms
Manufacturer	Sennheiser
Mfr Part Number	HD 450SE Black
Model Name	Sennheiser HD 450SE Bluetooth 5.0 Wireless Headphone with Alexa - Active Noise Cancellation, 30-Hour Battery Life, USB-C Fast Charging, Foldable - Black
Model Number	HD 450SE Black
Noise Control	Active Noise Cancellation
Noise Control Features	active_noise_cancellation
Noise control	Active Noise Cancellation
Number of Items	1
Number of Packs	1
Sensitivity	94 dB
Series Number	450
Style Name	Special Edition
Subject Character	no character
Theme	Video Game
UPC	615104372283
Warranty Description	2 year international warranty by the manufacturer
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth

Sennheiser HD 450SE Bluetooth 5.0 Wireless Headphone with Alexa - Active Noise Cancellation, 30-Hour Battery Life, USB-C Fast Charging, Foldable - Black

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