Nepro “Minisonic”

Swiss Watch Fair 1970 BF 905
The world s smallest alarm clock with electronic alarm. And the alarm is astonishingly powerful even people who are hard of hearing perceive its sound, in great part because of the frequency of the electronic vibrations. The alarm rings continuously for 10 minutes unless it is turned off. Battery life 1 year. The alarm is sheathed in a leather mini-case, with key-chain. (NEPRO “Minisonic”)