| audio signal(expression, technology, radio, audio) |
| bone conduction(expression, technology, radio, audio) |
| digital audio player(expression, technology, radio, audio) |
| electrical signal(expression, technology, radio, audio) |
| electronic musical instrument(expression, technology, radio, audio) |
| headphone amplifier(expression, technology, radio, audio) |
| high fidelity(expression, technology, radio, audio) |
| in-ear monitor(expression, technology, radio, audio) |
| personal computer(expression, technology, radio, audio) |
| phone jack(expression, technology, radio, audio) |
| portable media player(expression, technology, radio, audio) |
| radio wave(expression, technology, radio, audio) |
| telephone operator(expression, technology, radio, audio) |
| video game console(expression, technology, radio, audio) |
| bluetooth(noun, technology, function, device) |
| computer(noun, technology, function, device) |
| laptop(noun, technology, function, device) |
| radio(noun, technology, function, device) |
| tablet(noun, technology, function, device) |
| audiophile(noun, technology, function, device) |