This is a good emergency tool for you.
Features:
Safety and survival aid products for inshore and offshore use.
Combination of two essential survival items: signaling mirror and whistle.
The signal mirror is made of lightweight acrylic.
Breakaway lanyard attached.
Find an objective and let the sun ray pass through the heliograph toward objective and you are signaling.
Specifications:
Material: Acrylic & ABS
Item size: 5.6 * 5.6 * 0.6cm / 2.2 * 2.2 * 0.2in
Package weight: 35g / 1.23oz
Package size: 8 * 7 * 1cm / 3.1 * 2.8 * 0.4in
Package List:
1 * Signal Mirror with Whistle