The tracer is good and has functioned well. I felt misled, however, by the website which suggested that I could buy a monthly subscription plan OR buy the unit outright. I bought it outright and when it arrived, I enjoyed using it for 5 days before suddenly I was required to buy a £90 annual subscription. By this time I had thrown away the packaging. I have asked the company to change this webpage; https://www.pettracer.co.uk/shop/ so that customers can easily see that if they buy the unit outright, they ALSO have to pay £90/year to operate the unit! They have not agreed to make this easy clarification.