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2. 10 Waterproof Bluetooth Speakers for Showers, Pool Parties ...

   www.aol.com/17-waterproof-speakers-thatll-sound...

   The sound is great, it's IP67 rated, and it looks infinitely better than anything else on the market. When it's not outside by the pool, we love to set it on display, like a real piece of luxury ...

3. Wireless speaker - Wikipedia

   en.wikipedia.org/wiki/Wireless_speaker

   Recent models generally use Bluetooth 4.0 or even Bluetooth 5, and wireless speakers generally have a range of 10 meters. [4] Bluetooth devices use a radio communication frequency such that the devices do not have to be in a visual line of sight with each other. Some speakers may benefit from the NFC system to facilitate pairing with the source ...

4. Bluetooth - Wikipedia

   en.wikipedia.org/wiki/Bluetooth

   Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to 10 metres (33 ft).

5. Supersonic speed - Wikipedia

   en.wikipedia.org/wiki/Supersonic_speed

   The sound source has now broken through the sound speed barrier, and is traveling at 1.4 times the speed of sound, c (Mach 1.4). Because the source is moving faster than the sound waves it creates, it actually leads the advancing wavefront. The sound source will pass by a stationary observer before the observer actually hears the sound it creates.

6. Bluetooth Low Energy - Wikipedia

   en.wikipedia.org/wiki/Bluetooth_Low_Energy

   Bluetooth Low Energy is distinct from the previous (often called "classic") Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR) protocol, but the two protocols can both be supported by one device: the Bluetooth 4.0 specification permits devices to implement either or both of the LE and BR/EDR systems. Bluetooth Low Energy uses the same 2.4 GHz ...

7. Sound barrier - Wikipedia

   en.wikipedia.org/wiki/Sound_barrier

   Subsonic. Mach 1. Supersonic. Shock wave. The sound barrier or sonic barrier is the large increase in aerodynamic drag and other undesirable effects experienced by an aircraft or other object when it approaches the speed of sound. When aircraft first approached the speed of sound, these effects were seen as constituting a barrier, making faster ...