This cat flap with an electromagnetic lock will give your pet a free pass to enter or leave the house even when the door is shut while denying access to intruders. The electromagnetic lock is triggered to open by a magnet that you attach to your cat’s collar. This cat flap has a transparent flap and works silently. The special sealing and magnetic safety lock help to keep out the draught. One 9 V battery is needed for operation (battery not included).