Dear , We want to manufacture something like your device for kids, we want to manufacture a wristband for kids, where parents can use a mobile app to send notification to these wristband like a vibration or sound, so the kid know that his/her parents reach to the school door and he/she then exit to the door. We don't know how the connectivity between the mobile app & the wristband , but i don't think it can be a Bluetooth because it will be a wide range. If you have solution for these please reply us . we will take 100.000 as a first stage, Best Regards Show More