It is not as unlikely as you might think... The cheaper buzzers have a single, preferred frequency (like [0] has 2.4KHz). And engineers like round numbers for t

It is not as unlikely as you might think... The cheaper buzzers have a single, preferred frequency (like [0] has 2.4KHz). And engineers like round numbers for time delays. So I can imagine a spec which says "do a cheapest buzzer on its preferred frequency, 1 second period, 50% duty cycle, 3 times" being independently written in 3 different engineering offices, and multiple devices ending up with identical beeps. [0] https://www.digikey.com/en/products/detail/pui-audio-inc/AT-1224-TWT-5V-2-R/5011404 https://www.digikey.com/en/products/detail/pui-audio-inc/AT-...