Pressing the button triggers two audible beeps to alert election observers about the illegal votes. Most also report POST errors with audible beeps, if a PC speaker is attached. Thus the Morse code is audible as musical "beeps" in the earphones. Thus the "dots" and "dashes" of Morse code were audible as musical "beeps". A timer beeps at an increasing rate before randomly buzzing, signalling the end of turn. Participants perceived illusory flashes when there were more beeps than flashes. Consequently, sound is limited to single channel beeps and whistles as befits a 'business' machine. Thus the Morse code "dots" and "dashes" sounded like beeps. The sensor beeps and measures the time it takes for the signal to return. The toy would then emit a series of high-pitched beeps. The visuals were represented by red LED lights and the sound consisted of simple beeps. Hz pure tone beeps at 97-112 decibels. The progression from one level to the next is signaled by 3 quick beeps. Temperature and pressure were encoded in the duration of radio beeps. As the test continues, the time between beeps gets shorter.