Has anyone here ever tried to install any kind of an audible alert for the keyless entry? Maybe its a bit of OCD on my part, but I really like knowing my car is locked. And using the same button to lock/unlock isn't helping my obsession.

Also, getting the silent treatment from the car when it locks isn't the best, either. I know the lights flash, but I'm not always in a position to watch the lights to make sure the lock signal was recieved.
I was thinking just a small beep of some kind would be very helpful to go along with the light flashing, and there must be some kind of product on the market to accomplish this - I'm just not sure where to begin.
Any suggestions?