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.
Manufactured in 1996. Connects to phone line and 120VAC wall outlet. Useful for phones in loud rooms.