How should I deduct a garage door opener for a rental property?

Hi
I put a new garage door opener in my rental (never had any) and paid around $450.
Turbo tax asks me about the "election" between expense in the year or appreciation, but if I read the explanation for "process" it says item has to have useful life of 12months or less.
I am guessing that option is out then?
And if yes, how many years should I use for the depreciation?

thanks!