Universal Heavy Duty 12V 2-Wire Black Car Power Door Lock Actuator - Durable & Reliable for Auto Locks, Trucks, SUVs & More

I use it with a sonoff wifi switch and a 12v power adapter to let my dogs out of the garage when i am at work. I made the back door spring loaded to pull open. I start work early and the dogs dont need to be in the back yard barking at 5am. Disturbing the neighbors. Now i can open the door from work at a later hour and let the neighbors sleep. The sonoff switch is only 6.50 at amazon. The trunk release has a 1 inch travel and will either push or pull depending on the polarity of the power. Works great! How ever if you leave power to it, it will get hot fast and probably burn out, or start a fire. Its risky to rely on wifi to shut it off. I rigged a momentary push button switch (also from amazon) like a horn or doorbell switch that only makes electrical contact when it is pressed in. I have the switch wired between the trunk release and the positive side of the 12volt adapter. As soon as the door opens the switch also releases and shuts off the 12volts to the trunk release. This way there is no urgent need to shut off the sonoff switch, in a rare case if my phone went dead before i could do that. Of course in order for this to work, you must be sure the door knob doesn't catch. I drilled a 1/4 inch hole in the side of the door and slide the pin in from the trunk release to load it before i leave the house. If the dogs push on the door, the doorknob still wont engage in it catch.