Until recently I had a pebble smart-watch. Unfortunately it was stolen :( The thing I missed the most was the vibrations from the notifications. It felt a bit bare without it. This got me thinking; what if I had 2 (both arms) or 4 (arms and legs) vibrating wristbands on and depending on the notification it would vibrate a specific pattern. Could I teach/train my body to recognize the pattern? Basically the same than a smart watch, but no visual indication.
The most useful feature of my pebble was indicating that someone is texting me or trying to contact me while I was driving. Without picking up my phone (dangerous while driving), I knew whether I need to stop and phone my boss or whether it was just a sms with the latest pizza specials (which I can ignore until I get home). This can be translated into the wristbands, ie. a slow vibration on my right leg indicates that it's not important but a fast buzz on my right wrist means that I need to make/take the call