I haven't had any problems with it staying in sync once I moved it away from computer, wireless speakers, cordless phone, etc. I, first, put it on the window sill, wood framed over steel, with sensor in skimmer only about 25 ft from window. Signal was not great. I then moved it away from window, about 10 ft, sitting on top of wooden cabinet and signal is strong and steady.
We live about a mile away from the largest TV tower forest in the US. So we are bombarded by all kinds of signals. (except for analog TV signals that went right over us) Most metals, used in our house, act like receivers so I wasn't sure the wireless Temp Sensor would even work. It has worked flawlessly for a month or so. Over the years some wireless things just won't function properly in our house. We have a "ghost" who turns our way up high fans and fan lights, on/off and fan speed changes. :grrrr:
BTW.... I put mine in the skimmer because of wind and doggies retrieving it for a dog toy (with resulting death to anything that isn't a real doggie toy).
gg=alice