That's the same display that I had. It died after 3 1/2 years of use.. No way to set it only for the days total. There's a strange algorithm which is hard to decipher what it does when it comes to rain periods, days and what it reports. Makes the display useless to me. If you hit a dry spell I've seen it go to up to 2 weeks, but after 48 hours of no rain it will reset to the days total on the next rain event. Hard to figure.