BXT Outdoor Camping 7 in 1 Survival Whistle with lanyard Army Green Material:ABS//Dimension: 3.8X1.2X1.2inches Temperature range:minus 4 Fahrenheit-122 Fahrenheit Sold with a nylon lanyard Whistle sounds very loud, you can hear it even from long distance With several functions: Whistle, compass, thermometer, magnifying glass, mirror, small leds lamps, and gas-tight silo