Product review (1 stars): Accurate within 15 degrees F
The outside temperature seemed way off so I brought the sensor indoors, changed the batteries and set it next to the readout.  IN - 72F OUT - 58F and they are right next to each other!!  I found out the unit was defective after the return date so I am stuck with a piece of $20 e-waste.  Don't be tempted by the low price - this is pure garbage.