Fox 40 Whistle
Tree work is hazardous; a slip, accident, or unseen hazard could mean you need to get someone's attention at a distance and over the sound of saws. A whistle can summon help, alert someone to a hazard or get another climber's attention with a loud blast up to 115 decibels. New this year is the FOX40 classic, tri-chamber whistle, which can be heard up to 1 mile away!
The retractable lanyard (sold separately) is a handy way to keep your whistle out of the way, but easy to draw and use when needed.