Using OPK digital unit from 2015?

Hi there! I used the clearblue advanced digital OPK back in 2015 when TTC my first child and it worked great! I want to use them again in the next few months in trying to conceive our second. I am wondering: will the digital unit from 2015 still work? Will it need to recalibrate or anything; is there anything I should do other than the usual instructions (calculate the proper start date based on my cycle, and so forth)?