I thought I had a shrew with me ... I have installed in my garage this trap there two days and already captured 7! This trap is very effective ... I have a cat that refuses to kill shrews, as many cats. This box allows to capture alive and release them later (attention away enough to your home. These little rodents of instinct and know return to their "home"!) In short, the delivery was very fast, the device requires no manipulation and shows ruthlessly efficient. No bait is necessary, I still put some kibble my cat, the girls love it!