Product review (1 stars): Don't waste your money.
Immediately started getting inaccurate readings.  On a 68 degree day it was reading 158 with 98 percent humidity outside (did I mention I don't live on the sun?). Then after pulling the batteries and trying again it read 32 degrees outside.  I out the base unit outside and it showed the indoor temp at 64 and outdoor at 32 (both base and sensor were outside so they should of had identical readings).