Terminal rental is where a cheap headline rate quietly becomes expensive. There are hard limits on how long that contract can hold you.
An initial minimum term for a POS terminal lease or rental cannot be longer than 18 months. After it ends, contracts that keep running must roll on terms no longer than 31 calendar days.
Find the start date of your terminal contract and count 18 months forward. Put that date in the calendar with a reminder two months before it.