Before going to crowded places, put a tattoo (or bracelet) with your phone number on your children's arm. If he/she get lost somebody can call you and make your baby safe at home. This is not a new idea, but I found that the tattoo can be used extensively: probably with a few bucks you can get 10 tattoos or more. Bracelets can be "built on demand", or available with customizable numbers.
- Makes kids safer
- No batteries needed!
- Can contain more info if needed, like specific medical conditions
- Suitable also for animals, very small children or adults with dementia or alzheimer, more in general you don't have to remember anything
- Not much technology involved
- Can be used for social engineering: I see the number, I call the number, I can fake that something bad is happening
- Possibile allergies
- I wasn't able to find tattoo papers for cheap
- Not a new idea
- How to scale properly?
- GPS/RFID/NFC/whatever bracelets are already on the market with apps, etc...
Check https://github.com/napolux/1000ideas for license and FAQ