The original Joy Buzzer was called the Joke Buzzer (1932 U.S. patent #1845735, Soren Adams) and it replaced the more dangerous Zapper, which is lost to time, more's the pity. Our standard wind-up model is a 1-3/8" dia circle of perennial vibrating fun, with a 7/8" dia finger loop. (Watch for the solar-powered joy buzzer, still under development.)