Vibration pads could be more widely used than they are. I'm thinking of the direction belt, and, then, this. It's a great, non-other-disturbing asynchronous ale

Vibration pads could be more widely used than they are. I'm thinking of the direction belt, and, then, this. It's a great, non-other-disturbing asynchronous alert. You could have one on your watch band, or tucked inside your belt.