You simply stick it to the inside of your windscreen and then drive up to the barrier at the toll booths - the device beeps, the barrier opens, and off you go again.
You don't need to open a window, or undo your seatbelt, or get out of the car (in the pouring rain!) to get a ticket from the machine or throw coins into a basket.
And, if you use this link you'll get €5 off your fees:
https://www.emovis-tag.co.uk/subscripti ... 4-4B6F2A23
You're welcome
