I have to start by saying that there are similar products on the market but I'm taking a different approach.
What I am trying to make is a "kid finder". My first idea is of a wrist watch with Bluetooth, GPS and Wifi. Different to other products is that 1) this is a finder, not to keep track of your kids, 2) anti tampering, other products are easily removed by anyone.
I want to also include accelometer and health related add-ons such as heart rate, temperature, etc.
Ten watch will connect to Mac, Android, etc. I also want to create a parent version that connects to the child's.
I have the idea, just not the funding to start a prototype.