take a small battery alarm clock wind fish line around the battery, place approx 2 and 1/2 high or chest height on deer across the trail used , deer goes by .pulls battery out clock stops giving time deer passed the spot... works every time . for a guy who cant afford game cams etc , or on a budget from the wife , i have used this myself , and have bagged deer spending only 2 hours in my stand because i knew when ole bucky was moving to feed or go to bed anyway i got him in 2 hours once i knew when he came by my stand,,, cost less than 10 dollars, time saved priceless no doubt try it just pay attention to the time you set the clock too... and it will tell you when it was stopped