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The Backsee wide angle window lens allows you to actually see many things which you cannot see through your inside rear mirror or side mirror.
You will find it helpful and protective for avoiding possible accidents in your blind spot.
Apply the Backsee window lens to the inside of rear window close to the bottom edge. For safer backing the curb side is recommended.
The Backsee window lens can be cleaned with a mild detergent and water.
A lower view can be seen by applying the Backsee window lens to the inside of an office window in a high building.
The Backsee window lens can be cut by scissors into smaller pieces for small window application. You may apply the Backsee window lens for other purposes depending on you idea.