Issues with Technology

One problem I have had is keeping track of the technology.  Even though I thought I had very carefully counted all of the headphones, one set walked out of my room.  (It was later returned by the student.)  In order avoid that, I started counting/ recounting all of the equipment when I collect it and then again when I hand it to the next class.  Needless to say, this takes a large amount of class time. I don't know a better way to do this, so a different idea would be great.