Wheelock RSSPA-24MCW-ALW Strobe 24 Volt Wording Alert Amber Lens White BodyThe Wheelock amber and alert notification strobe and speaker strobe appliances are built with the same high quality circuits and parts used in the Wheelock life safety strobes and speakers, Available with clear or amber lenses, with other colors and lettering available through special order. The amber lens strobe products are listed under UL Standard 1638 for general signaling and the amber lenses been tested to meet UL 1971 light distribution.