Harris Reusable Catch & Release Humane Mouse Trap, 1 Trap helps with your rodent problem without harming the mouse. They are easy to use and ideal for all animal lovers. To use, simply bait, catch and release! Placing several traps around suspected infestation area is recommended. When the mouse enters the trap, the spring door will close shut. The trap contains air holes for ventilation but still be sure to check daily and release mice back into the wild. Ideal Indoor use basement, garages, warehouse, attic, and more and release rodent outdoors.