Smallest and lightest beeper on the market. Features Volume control. 4 selectable beeper sounds: Standard Beep, Hawk Scream, Bob White recall, and Trill. Audible to 400 yard. 3 selectable modes: - Silent run-beep every second on point - Beep every 5 seconds on run-beep every second on point - Beep every 10 seconds on run-beep every second on point Low battery detect. Waterproof and rugged. Backed by a lifetime warranty.