Edwards Signaling horn/strobes are high quality signals intended for use in cUL general signaling applications. The strobes flash at 1 fps across their full operating voltage range. Models 867STR(*)-AQ, 868STR(*)-AQ and 869STR(*)-AQ potentially generate timing signals or pulses above 9 kHz and therefore have been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules.