Anti Sleep Driver Alarm with Vibrate Alert - Capsloc Anti-Sleep Alarm for Drivers, Security Guards, Road Trip, Late Night Workers

Great for any situation in which you don't want to nod off. Good for when other people are around because they won't even know you are using it because to anyone but yourself it is silent. The battery unfortunately quickly ran out, I think because I put it in my pocket and the switch which turns on and off very easily, must have gotten pushed by mistake. It is very comfortable (light weight, flexible, and a good shape), and not jarring when it goes off and at the same time does a very effective job of waking you up.

Great concept but the ear pieces are only for very small ears.