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2. The 6 Best Sound Machines for a Restful Night's Sleep - AOL

   www.aol.com/6-best-sound-machines-restful...

   Evo. Close to 8,000 Amazon customers are loving this device to fall and stay asleep. Choose between 10 white, pink, and brown noise variations, along with two ocean- and 10 additional fan options ...

3. 5 Great Sound Machines That Will Transform Your Sleep - AOL

   www.aol.com/5-great-sound-machines-sleeping...

   In fact, this sound machine offers only the essentials, including a volume knob, a timer, and just six built-in sounds (White Noise, Thunder, Ocean, Rain, Summer Night, and Brook).

4. These Sound Machines Help You Doze Off Fast and Sleep ... - AOL

   www.aol.com/sound-machines-help-doze-off...

   Ahead, check out the best sound machines for better sleep, based on expert advice. Restore 2 Hatch’s Restore 2 is a multifunctional sleep aid with a slightly different design and a few more ...

5. White noise machine - Wikipedia

   en.wikipedia.org/wiki/White_noise_machine

   A LectroFan white noise machine A clock radio that includes a white noise machine. A white noise machine is a device that produces a noise that calms the listener [citation needed], which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds.

6. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...

7. Stump microphone - Wikipedia

   en.wikipedia.org/wiki/Stump_microphone

   A stump microphone, informally known as a stump mic, is a microphone embedded in a cricket stump. It was originally developed by Kerry Packer for World Series Cricket in the 1970s. [1] At first it was primarily for entertainment value: "television audiences could hear the rattle of stumps". [2]