Circuit tester

Im using a 120v wall adapter with 5v output. I want to plug it into the wall outlets when Im testing electrical circuits at work. Im an electrician so when I turn on the breaker in the house I wired I want the tester to make a loud chirping sound so I know its on. What sort of component could I put on the adapter to make a loud chirping sound? thx

Get a Sonalert

Here are some surplus ones, found by Googling "Surplus Sonalert"

More ideas

These typically run on dc, so get a DC output wall wart. (Or **broken link removed**)