Kill Chirp is designed to produce low volume Woodpecker distress chirps. Designed to attract predators to the trap location. Lithium battery has 10 day life span. Press and hold the power button to turn chirp on or turn off. Field Use: Kill Chirp is deadly on all predators that hunt or kill for food including Coyote, Fox, Raccoon, Mink, Otter, Marten, Fisher, Bobcat, Lynx, and Wolf. Place Kill Chirp so animal must pass over trap to investigate. Intermittent distress chirps drive predators crazy as they attempt to locate the wounded bird. The Kill Chirp works well when placed in cubbies, live traps, above pine sets, and has a multitude of trapping applications. It is recommended to use both the Kill Chirp and the Kill Squeak as change-up sounds on your trapline, as you would lure and bait. Batteries included!