iStrategyLabs has developed a small device called the Ruby meant to be worn inside a shoe that can trigger a command on a smartphone app, called Dorothy, by clicking your heels together three times. While it is marketed as a way to call an Uber cab or order a pizza, it can also be set to text friends with location data and, presumably, call for help.
The product is still in development, but the possible uses for it are extensive. Their promotion video uses the example of triggering a fake phone call to get out of a tedious date, but this could be extended to send emergency information if that date turns violent.
Could this be a viable tool for travelers or development workers that find themselves in unsafe areas? Can you think of other uses for the gadget in a development context? Let us know what you think in the comments below.