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  2. Back-up beeper - Wikipedia

    en.wikipedia.org/wiki/Back-up_beeper

    Back-up beepers or an observer are required by OSHA for earth-moving vehicles with an obstructed view to the rear and no one on the ground to help guide the driver. [9] OSHA regulation 29 CFR Part 1926.601(b)(4) requires "a reverse signal alarm audible above surrounding noise level", but only when the motor vehicle has "an obstructed view to the rear".

  3. Invisible Fence Inc. - Wikipedia

    en.wikipedia.org/wiki/Invisible_Fence_Inc.

    Invisible Fence Inc. (commonly referred to as Invisible Fence Brand) is a company that designs radio pet fences for cats and dogs. Manufactured and distributed by Radio System Corporation, the company sells wireless and fenceless systems that were first introduced in 1973. [ 1 ]

  4. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    This type of system is vulnerable to intruders digging under the fence. A concrete footing directly below the fence is installed to prevent this type of attack. Taut wire fence systems have low false alarm rates, reliable sensors, and high detection rates, but is expensive and complicated to install.

  5. Motorola Minitor - Wikipedia

    en.wikipedia.org/wiki/Motorola_Minitor

    The audible alarm on the Minitor lasts only for the duration of the second activation tone. If there is bad reception, the pager may only sound a quick beep, and the user may not be alerted properly. This can be changed by editing the codeplug's "Alert Duration" from STD to Fixed, the user can then set the alert duration longer than the second ...

  6. Power-on self-test - Wikipedia

    en.wikipedia.org/wiki/Power-on_self-test

    Macs made after 1987 but prior to 1998, upon failing the POST, will immediately halt with a "death chime", which is a sound that varies by model; it can be a simple beep, a car crash sound, the sound of shattering glass, a short musical tone, or more. On the screen, if working, will be the Sad Mac icon, along with two hexadecimal strings, which ...

  7. How to reset a smoke alarm that won’t stop beeping - AOL

    www.aol.com/reset-smoke-alarm-won-t-205535790.html

    We’ve all been there. It’s 2 a.m. and you hear an eardrum-piercing beep. Your first reaction is to cover your head with a pillow and ... Read moreHow to reset a smoke alarm that won’t stop ...

  8. Remote keyless system - Wikipedia

    en.wikipedia.org/wiki/Remote_keyless_system

    For example, Toyota, Scion, and Lexus use a chirp system to signify the car being locked/unlocked. While two beeps means that driver's door is unlocked, four beeps means all doors are unlocked. One long beep is for the trunk or power tailgate. One short beep signifies that the car is locked and alarm is set.

  9. Covert listening device - Wikipedia

    en.wikipedia.org/wiki/Covert_listening_device

    The car of Thomas Hentschell, who was involved in the Melbourne gangland killings, was bugged by police. In 1999, the US expelled a Russian diplomat, accusing him of using a listening device in a top floor conference room used by diplomats in the United States Department of State headquarters. [28]