Simple and effective
Got this for my folks, who tend to have the TV up pretty loud and sometimes don't hear the phone.  Bright white LEDs get your attention as long as the unit is somewhere in your field of view (meaning they're not bright enough to throw light from behind you and you'll notice it--possible if the room was dark, but at most recommend keeping it within your peripheral view).  I had originally thought I'd rig up something to flash a table lamp but this is simple, easy solution that works just fine.  Since my parents' FiOS phone setup still sends out the required high voltage burst to get the phone ringer to work, this flasher works as well as if it were hooked to an old-style phone system.
Rating: 4 stars