Bought three and glued two to my shoe cover made for a lawn tractor to sit right over to extend its winter cab and the third was mounted on the lawn mower's rear tool box. Used all last winter, no battery needed. Let's see how far I can throw snow this coming winter before they have to change their batteries. Very bright and eye-catching. The magnets are very strong. Don't install something like a square cut out of a t-shirt as a turn signal with no room on a new car, the magnets have a steel ring even with magnets and will leave a ring on the paint surface.
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