We do the heat seal for the packaging of this Zoombak product. www.zoombak.com I don't know much about them yet. I also found this one yesterday, I like that it looks like you don't have to buy a service plan unless you need it. http://www.rmtracking.com/gpsproducts/smarttrack.html Both use T-mobile cell which in a lot of places is spotty at best, however. So basically they are the same just different plans it seems.