Coghlanâ??s Four Function Whistle is a useful multifunction device is excellent for reading a map and orienteering. The whistle features 4 key functions that are helpful in navigating the outdoors. Includes a compass for finding your direction and when orienteering. The builtin whistle is loud enough to alert others of your presence. On the back of the whistle is a thermometer that accurately tells the temperature and inside is a magnifier that is useful for reading maps or viewing details on items. The Four Function Whistle also includes a convenient clip to attach to a zipper belt lanyard or backpack. Compass is ideal for reading a map or orienteering. Whistle is loud enough to alert others of your presence. Thermometer accurately tells the temperature in both and Magnifier is useful for reading maps or viewing details on items. Easily attaches to a zipper for quick and easy access. Each whistle has a UPC sticker Mixed colors black blaze orange and lime