  Signal Mirror
It may not be high-tech, but using the sun's rays to transmit a brilliant signal or code is a time-tested method with an unlimited operating life. This item is a simple necessity for any survival kit aboard any vessel. Specially plated steel, with high reflection surface and a recessed hole for sighting, this mirror is manufactured in accordance with military specifications and packaged in a heat-sealed vapor-proof pouch.
Check out the ACR Hot Shot Signaling Mirror
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