Joy buzzer

Patent drawing, from Soren Adams's 1932 US patent application.

A joy buzzer (also called a hand buzzer) is a practical joke device that consists of a coiled spring inside a disc worn in the palm of the hand. When the wearer shakes hands with another person, a button on the disc releases the spring, which rapidly unwinds creating a vibration that feels somewhat like an electric shock to someone not expecting it.

单词	Joy Buzzer
释义	Joy Buzzer 英语百科 Joy buzzer A joy buzzer (also called a hand buzzer) is a practical joke device that consists of a coiled spring inside a disc worn in the palm of the hand. When the wearer shakes hands with another person, a button on the disc releases the spring, which rapidly unwinds creating a vibration that feels somewhat like an electric shock to someone not expecting it.
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Joy Buzzer

Joy buzzer