Wiktionary
n. 1 A burglar alarm or fire alarm that transmits a warning radio signal when activated 2 A combination radio and alarm clock; a radio alarm clock
Usage examples of "radio alarm".
Reason told him that if anything serious had happened he would have been awakened--he had slept through the clock-radio alarm before, but he'd never failed to be aroused by a phone.
Her radio alarm clock woke her up the next morning with the news that she was a poor bastard in need of divine intervention.
He sped back into the skyscraper and put in a call to headquarters, advising them to spread a radio alarm for the taxi.
Probably with a broad-band radio alarm as well, he thought, remembering how promptly their own call had been answered the very first time they had ever sent anything over the rim of their crater.
They stayed that way, nerves on edge and stomachs tight, and range steadily closing, until it seemed that the blips must not be the task force, perhaps were even some wandering uncharted asteroid-when the radio alarm, sweeping automatically the communication frequencies, clangingly broke the silence.
In a few moments some heavy-footed minions of the law would come barreling around the corner while, I am sure, a radio alarm would be drawing in reinforcements to cut me off.