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2. History of radio - Wikipedia

   en.wikipedia.org/wiki/History_of_radio

   Heinrich Rudolf Hertz (1856–1894) proved the existence of electromagnetic radiation. In an 1864 presentation, published in 1865, James Clerk Maxwell proposed theories of electromagnetism and mathematical proofs demonstrating that light, radio and x-rays were all types of electromagnetic waves propagating through free space.

3. Samsung Galaxy Buds series - Wikipedia

   en.wikipedia.org/wiki/Samsung_Galaxy_Buds_series

   Earbuds size 16.5 x 27.3 x 14.9mm Earbuds weight 5.6g Case size 50.0 x 50.2 x 27.8mm Case weight 42.2g Network Bluetooth 5.0 Sensors Accelerometer, Infrared sensor, Hall sensor, Touch sensor, Grip sensor, Voice Pickup Unit Battery Earbuds: 60mAh Case: 500mAh Charging USB-C and Qi wireless charging

4. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   There is a general danger that listening to loud music in headphones can distract the listener and lead to injury and accidents. [11] [12] Noise-cancelling headphones add extra risk. Several countries and states have made it illegal to wear headphones while driving or cycling. [13]

5. Silent disco - Wikipedia

   en.wikipedia.org/wiki/Silent_disco

   A silent disco or silent rave is an event where people dance to music listened to on wireless headphones. [1] Rather than using a speaker system, music is broadcast via a radio transmitter with the signal being picked up by wireless headphone receivers worn by the participants. Those without the headphones hear no music, giving the effect of a ...

6. AirPods Pro - Wikipedia

   en.wikipedia.org/wiki/AirPods_Pro

   AirPods Pro are wireless Bluetooth in-ear headphones designed by Apple, initially introduced on October 30, 2019. [5] [6] They are Apple's mid-range wireless headphones, available alongside the base-level AirPods and the highest-end AirPods Max. The first-generation AirPods Pro use the H1 chip, also found in the second-generation base-level ...

7. In-ear monitor - Wikipedia

   en.wikipedia.org/wiki/In-ear_monitor

   A case of in ear monitor receivers. Most professional stage in-ear monitor systems use wireless technology to send the mix to the IEMs. This type of system consists of a stationary offstage transmitter and an onstage receiver (about the size of a deck of cards) that is worn by the performer.