Bought this item about a month a go and I seem to be having trouble with the sensor chewing batteries up. The sensor takes a standard cr2032 button 3v. I changed the origanal battery that came in the box which was a panasonic to a GM make which only seems to last an hour or so. It maybe the cheap GM battery is not holding the charge I dont know and the original battery that came with the unit only lasted less than a month. I have just ordered a 10x pk of Duracell batteries to see if they make any difference. The computer is great when it works and just wondered if anyone else on the forum has purchased the same wirless model and had any issues with it. The unit was not a cheap item and I expect the thing to be a little bit more reliable than it has.