I have SONY wireless headphones. They are “Circumaural” which means “around the ear” rather than ON the ear. They are the most comfortable headphones I have ever worn, and I wear mine over 8 hours per day (I am retired and after a career working with computers, I now spend most of my free time on my own PC). https://oldtimemusic.com/most-comfortable-headphones/
I often forget to take mine off before going to bed.
The yellow bots are easily seen using a black light and a magnifying glass. The magnifying glass is necessary since they are usually only 1 pel (picture element or pixel)in size.
I have both items I bought to present proof of fraud in a court case.
Do you realize that while valid ballots printed on offset printers may not have these markings most other commercial and consumer laser printers do have these markings?
I used to work at a telephone company as a "Systems Specialist" (equivalent to a senior Systems Analyst) where part of my job involved modifying the font on a high speed laser printer which printed out thousands of bills every day.
The paper used came in extremely large rolls which were fed into the printer intact.
The printer I worked on was much larger than the one showed at the following link and it also included separating each bill and inserting it into envelopes which it also printed.
https://www.biline.ca/4100.htm The paper used came in extremely large rolls which were fed into the printer intact.