Poor range for transmitter, it says it has a range of 600', I could not get it to reliably function at less than half that range. Product was installed on flat ground and "line of sight" to receiver. Even at close range probe would not reliably detect a vehicle. Strongly recommend you pass on this device. The only reason I rated it at one star is because there was not a lower rating. I have worked in the electrical/electronic industry for over 30 years and feel qualified to describe this device as an inferior product that will not function as described.Thank goodness for Amazon's return policy.