It can be used on cloudy day or at night. Can be used as mirror at ordinary times.Suitable for long-distance communication in the field and send reflective .
On clear day, optical can travel more than 100 kilometers.dive mirror Emergency emergency hand heliograph mini camping reflective diving signaling signalling small sol and firefighter
There is a whistle on the lanyard, can be used when you need to be rescued.
Suitable for long-distance communication in the field and send reflective .
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