Well, size wise it has to be a specific diameter to go through the tube and have enough room inside for checks and deposit slips etc.
But there seems to be about 10x more circuity in there than needed.
It’s basically just a sig pad with a 2.4ghz wireless receiver/sender. I’ve seen wireless cards for laptops no bigger than a USB thumb drive, and we’ve got lots of wired sig pads that aren’t much bigger than pack of cards. So I don’t get why this thing is so packed full of electronics.
It weighs like 2lbs. When it comes down the 6 foot or so drop most tubes have it’s gonna land with one hell of a thump.