DELMAR, NY—Craig Mitich, 27, has spent 20 minutes searching his apartment for whatever the hell is emitting a high-pitched beep every few minutes. "Okay, it's not my cell phone… it's not my microwave… or my car-alarm remote," said Mitich, standing motionless with an ear cocked toward his entertainment center. "God, what is it? Can a power strip beep?" At press time, Mitich was on his hands and knees, unplugging his appliances one by one.