The Safe Zone Helmet Mirror is simply the finest helmet-mounted bicycle mirror made. Safety-oriented cyclists quickly come to realize that the Safe Zone is superior in functionality and durability to all competing helmet mirrors. The 2 1/4" mirror yields a huge field of view, much larger than any other helmet mirror. The mirrors size makes it easy to view everything approaching from the rear while the sturdy mounting is unparalleled - with no weak adhesives or fragile parts! Additionally, the linked flexible arm is easy to adjust, maintains functionality and is guaranteed not to loosen! Position the Safe Zone Mirror’s mounting base on the left, forward section of your helmet. The optimal mirror placement is at least 5” from your eye. When the position is just right, apply plastic zip-ties to keep the position secure. To adjust the mirror for optimum view, cup the back of the mirror in one hand while bending or rotating the flexible arm as needed until you find a position that offers the best visibility. Notice that your awareness of the road behind you now goes beyond anything you previously knew was possible. We personally service the 5-Year No-Fault Warranty, so you dont have to worry about your bicycle rear-view needs for at least 5 years from purchase. Try it out and were sure youll agree that the Safe Zone is the finest bicycle helmet mirror made!