Circle-m rat trap cage trap it can catch mouse up to 10-15 one time. The design is reasonable and kindly. It doesn't hurt any pets and children. The way to set the trap, firstly, turns the side button of the cage trap. Strain the turn pole link with inside torque spring. You can turn 7-10 circles one setting (you feel torque spring is strong enough now) then the cage trap setting is finished.