Don't think it has been used as one of the cables is still sealed in packaging. If it was used it was minimally. The item "Sense Home Energy Monitor SM2 Track Electricity Usage" is in sale since Tuesday, February 5, 2019.This item is in the category "Consumer Electronics\Surveillance & Smart Home Electronics\Other Smart Home Electronics". The seller is "clastores09" and is located in Pasadena, California. This item can be shipped to United States.