Terro Fly Magnet Fly Trap 

Attracts and traps a variety of common flies, including house flies, barn flies, and bottle flies Contains no chemical insecticides Easy to use – add the included bait, fill with water, and hang Decorative trap pattern hides trapped flies from view Reusable trap can be emptied and re-baited once full For outdoor use – draw flies away from your home before they come indoors Bait fully activates after a few hours; effectiveness will not be diminished over time