I've had one something like this for years although it's brand is "National."
I used it alot for 3-4 years but since I got accustomed to my J-pouch, plus I'm retired, I only use it once in a while. It runs on batteries and holds about 5 oz of water which I fill from a tap. I think I paid around $130 for it more than 10 years ago.
It folds up and fits nicely in a fannie pack along with some butt burn cream and an extra pair of shorts. I keep it in the trunk of the car.
BTW, it makes sort of a whirrling sound maybe like a vibrator so prepare yourself for some strange looks when you leave the cubicle.
Dave D