Review on 🚴 PChero Bike Glasses Mirror: 360° Adjustable Wide Angle Rear View Mirror for Safe Mountain/Road Cycling by Rafael Gomez

It does what it's supposed to: gives you a picture of what's going on behind you. This works best when the ground is smooth or when you are standing still. Otherwise, shaking will give a blurry image, and the mirror at the end of a thin rod will shake as you move. But it works for me as I just need to know if someone is behind me or ready to go around me. Attaches to sunglasses easily and conveniently. Not perfect, but sufficient.