SUPVOX 3pcs Retroreflector Mirror Emergency Outdoor Accessories Signal Mirror Reflective for Long Distance

Outdoor accessories: there is a manual on back side which show you how to use this mirror,small mirror.
Signal mirror: it is suitable for long-distance communication in the field and sending signals for survival,reverse mirror.
Survival signal: suitable for outdoor activities and emergency uses, camping, hunting, skiing,marine.
Emergency mirror: with aiming function, signal transmission is accurate and fast,survival signal mirror.
Survival mirror: when the weather is clear, the optical signal transmission distance can than 100 kilometers,outdoor retroreflector.