GRIRIW Daylight Signal Mirror Outdoor Reflective Survival Mirror with Aiming Function for Emergency

With aiming function, signal transmission is accurate and fast.
There is a manual on back side which show you how to use this mirror.
Suitable for outdoor activities and emergency uses, camping, , skiing.
It is suitable for long-distance communication in the field and sending signals for survival.
When the weather is clear, the optical signal transmission distance can than 100 kilometers.