If you're looking for a compact piece of equipment with a variety of uses - you've found it. A very(!) loud whistle with 5 (!) additional functions: thermometer, LED torch, fluid stabilised compass, mini-signal mirror and magnifying glass. The LED has 3 button cells (SR1120, 1.5V (exchangeable). Well finished and too good to be just a toy.
Includes battery and plastic carabiner
3 coin cells SR1120, 1.5V (replaceable) were built in for the LEDs