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2. Transistor radio - Wikipedia

   en.wikipedia.org/wiki/Transistor_radio

   An early 2000s transistor radio (Sony Walkman SRF-S84 transistor radio, released 2001, shown without earphones) Rock 'n roll music became popular at the same time as transistor radios. Parents found that purchasing a small transistor radio was a way for children to listen to their music without using the family tube radio.

3. Crystal radio - Wikipedia

   en.wikipedia.org/wiki/Crystal_radio

   Swedish crystal radio from 1922 made by Radiola, with earphones. The device at top is the radio's cat's whisker detector. A second pair of earphone jacks is provided. 1970s-era Arrow crystal radio marketed to children. The earphone is on left.

4. FM transmitter (personal device) - Wikipedia

   en.wikipedia.org/wiki/FM_transmitter_(personal...

   A personal FM transmitter is a low-power FM radio transmitter that broadcasts a signal from a portable audio device (such as an MP3 player or a smartphone) to a standard FM radio. Most of these transmitters plug into the device's headphone jack and then broadcast the signal over an FM broadcast band frequency, so that it can be picked up by any ...

5. List of Sony Walkman products - Wikipedia

   en.wikipedia.org/wiki/List_of_Sony_Walkman_products

   The W series (Wearable) is a wearable music player built into a set of headphones. The original model, the NWZ-W202 was released in 2009 and had 2 GB of internal memory and could play 11 hours of music and can "quick-charge" for three minutes to yield up to 90 minutes of playback.

6. Creative Zen - Wikipedia

   en.wikipedia.org/wiki/Creative_Zen

   The replacement of the ZEN:VisionM, simply called "ZEN", offered many of the same features but in a small pocket-sized form factor. [33] This flash-based player was released on September 14, 2007, [34] in capacities of 2, 4, 8, and 16 GB. A 32 GB model was announced on December 4, 2007, setting a record for storage capacity among flash-based ...

7. Two-way radio - Wikipedia

   en.wikipedia.org/wiki/Two-way_radio

   Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...