I use the same system where they raise their hand and point to the door. I nod yes or no, then if yes they bring me their chromebook with a pass made and I click yes. When they return they grab the chromebook next to my podium, end it, and have a seat.
The student management on there is outstanding. You can look up any student to find out how many times they've been out of class, where they were, how long etc. I can now tell a kid, no because you've literally gone to the bathroom every period today.
It's been one of the best things the school here has purchased!