Core77

Drop your cellie (ringer off) into the Signal Cell Phone Adviser, and the device blinks when you've got a call, so everyone in the office doesn't have to hear your annoying Timbaland ringtone.

Doesn't matter what type of cell you have; the radio waves of an incoming call are what triggers the blinking.

We're putting this in the kind-of-cool-but-not-sure-we-need-it category. If you're more certain than we are, bring 21 bucks to this link.

[Via Product Dose.]