Gate Alarm for Your Backyard
If you're worried about young children getting into your swimming pool when you're not available to watch them, you might want to consider installing a fence around the pool and using a gate alarm to ensure no one enters without your knowing about it. A gate alarm is also an option for anyone who wants to keep the side gates to their backyard secured.
This programmable gate alarm from SmartHome has a keypad where you punch in a numeric code, just as you would to work an ATM. If someone tries to get in without entering the secret code, the alarm will go off and pretty much everybody in the neighborhood will know about it.
This system can be installed on wood or metal gates or even sliding glass doors. It's battery-powered, so you don't have to worry about running electrical wiring to it. As far as home improvement projects go, this is an easy one. This system will cost you $50: