This is the Coghlan's Four Function Whistle Essential Gear for Camping Backpacking

Features:

• 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 ?F and ?C
• Magnifier is useful for reading maps or viewing details on items.
• Easily attaches to a zipper for quick and easy access.
• Mixed colors: black, blaze orange and lime

Coghlan's Four Function Whistle is a useful multi-function 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 built-in 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.