We need a wireless gate alarm that doesn't make sound?

[Carter]

I am looking for something for my mom for mothers day. Since our dogs recently ran away ( we found them) I was looking for something that I could attach to my metal fence gate and have two lights inside next to my back door so the light would turn red if the gate was open so we would know to close it before letting them out and green if the gates are closed please help so far all I have seen are pool gates that ring when they are opened but we don't want that because we leave the gate open when we walk them and don't want it constantly ringing when we leave the backyard