I have used a LandAir/Sea device since obtaining a new KIA Telluride. This vehicle had an extraordinarily high theft rate in our region of the Midwest. The tracking device is hidden in my car. It retains its charge for a surprisingly long time and provides the information I have programmed or designated it to. It is easily followed by me on my smart phone. The price is quite reasonable to use. They helpfully provide a reminder when the contract requires renewal. This tracking system has provided me with valuable peace of mind.