Here is a personal rear view mirror that you can attach to your helmet, cap, or sunglasses to see what goes on behind you. Sehen is designed to keep bike riders and others safe on the road. It is designed not to vibrate a whole lot as you move.
More items like this: here
Sehen weighs only 9 grams, so it doesn’t make you uncomfortable. It is portable and requires no batteries. Expected to ship in October.
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