High Tech Pet Power Pet PX-2 Pet DoorThe ultimate in security and energy efficiency, the Power Pet PX door is the world's only pet operated door that opens completely under its own power when activated by your pet's ultrasonic collar. This amazing pet door will make your life easier by relieving you of "doggie doorman duty". Other pet doors may claim to be electronic, but genuine Power Pet doors are fully automatic and motor driven with a bulletproof translucent door panel that quickly and quietly powers upward into the stylish housing. This door is air-tight even in hurricane force winds providing the best insulation and energy efficiency of any pet door made. Animal and human intruders are prevented from entering by an automatic dead-bolt locking feature that adds a higher level of security than any other pet door. Only your pet, wearing the coded ultrasonic collar, is allowed to enter.Power Pet doors also feature an ingenious directional sensing system that opens the door only when your pet is on a direct approach, not when just wandering by or sitting next to the door. No Need to worry about pets or small children risking injury with a Power Pet door because the door panel is not closed by the motor, but by an intrinsically safe, gravity closure system that uses the panel's own weight (less than 1.5 lbs) to close. There's also a safety auto retract system that automatically raises the panel should it encounter an obstacle during closure. Dual Range Controls let you set independent inside and outside activation distances. 4-way access lets you choose in-only, out-only, full-access or closed-and-locked. Three Different Power Options: The Power Pet door may be powered by an AC wall adapter or by an optional rechargeable battery (Model B12V-1.3 sold separately). The optional battery keeps your door operating during a power outage and automatically recharges when power is restored. You may also power your door without a wall connection with the optionally available battery and charger kit (model CRG-12V sold separately).Installation is quick and easy because you don't install this door between the wall studs. The unit surface mounts to your door or wall. You cut an opening only slightly larger than the door panel itself. The door panel measures 12.25" W X 16" H to accommodate pets up to 100 lbs. Cut out size is 12.5" W X 17.25" H with an overall size of 16" W X 40.63" H X 2" D.