Roach and Ant repelant Devices, do they work?

I was wondering if anyone has used the Black and Decker Repelant devices that you plug into the electrical outlets ? I live in a large apartment building and even though I have used Combat Gel , professional roach gel and boric acid I still have roaches . Its a constant battle . My trash is out, dishes done , laundry done ,and my apt .is clean .Any suggestions ? I may have to move .