Get noticed from a great distance, with the loud, shrill, dual tone audible ACR Whistle. Lanyard is included to easily attach to life jacket, ring buoy, etc. Gets attention! Loud, shrill, dual tone audible from great distance. Unique flat design prevents holding water. Required by SOLAS 83. Meets USCGSOLAS requirements. Aids in land or sea rescues. Use on life jackets, vests, foul weather gear, ring buoys, rafts, keychains, etc. Developed for the U.S. Navy used by NASA, major airlines and shipping companies. Complete with 18 in. 45.5 cm of lanyard.