Thanks for the info. As far as I know UL325 compliance is not required by law except for state of Nevada.
All of the safety features required by the standard are supported by garage opener itself except for:
First version of the device will be in good company of numerous products and DIY solutions also lacking this feature while freely available for purchase at the reputable retailers. Still there’s a possibility that strobe/siren will be supplied as external module connected to the extension port.
BTW: many home owners find it quite annoying with the 5 seconds lag and the noise.