This is a awesome unit for tracking people and cars. A small hand held unit that you can put in your kids backpack. It sends a live signal every 30 seconds, so you can see where anyone is at anytime. Use for kids, use it to see where someone goes. You log online and see where it is at anytime. You can actually see the address where the unit is. It has a battery that lasts 24 hours, there is a plug cigarette lighter attachment as well.