Ingo Stylus
Ingo is a compact stylus, that can be added to your key chain and telescope to full size when needed.
The average stylus is large, heavy, and some of them need to be charged on a daily basis. These problems discourage people to use or bring a stylus along with them.
With Ingo, there are no batteries, or electronics to worry about. This mean no need to constantly charge it, fear of dead batteries, or having to pair with your devices.