The High Tech Pet Products PX-2 Power Pet Fully Automatic Pet Door offers the freedom that your large pets want with the security that you need. Because traditional doggie doors leave your home vulnerable to intruders, stray animals, and weather, this state-of-the-art pet door opens only with the sensor from the coordinating High Tech Pet Microsonic Collar. As your pet approaches, the door quickly and quietly opens upwards, meaning hesitant pets no longer have to push through swinging doors. Not only will this encourage use, but it also increases security with a kick-proof design. The automatic deadlock keeps it extra-secure, and the custom settings give you total control.