This is a video I've been trying to get around to for a while now. This is taking a brief look and then testing the Wheelock PS-15A Telstrobes I got last year. I plan on probably selling 6 of these. Hit me up if you want to buy one. I'll probably do $10 on each one.
http://www.smithgear.com/whps-15a-wpw.html The Wheelock PS-15A-WPW Telstrobe is a self-contained, plug-in strobe signal that emits a high-intensity flashing light when the telephone rings. The strobe is designed for use with standard analog phone lines, no ac power required.