Play the wind, avoid detection and increase your chance of hunting success with Fireflys Combo Pack. Compact, waterproof electronic wind detector provides accurate wind and thermal direction drifts down to 1 per second. It records 512 readings per second, and then reports the results with its easy-to-read flashing LED lights. Runs on two AAA batteries (not included). Combo Pack comes with a retractable lanyard with 60-lb.-break-strength stainless steel cable. Crush-resistant, waterproof ABS-plastic case perfectly fits the wind detector and lanyard, protecting everything from the elements. 6.5L x 2.5W x 3H. Type: Wind Detectors.