Stethoscope
A stethoscope is a medical device for listening inside the human or animal body. Doctors and veterinarians use this device to check heat beats per minute as well as the healthiness of the lungs and heart.
A common output device for listening to music is a speaker or headphones, which convert digital audio into sound. #LifestyleBranding
Yes.
when listening to your heart, lungs and sometimes stomach
Ear
Listening to music from an ipod/mp3 device.
man you going through unknown tunnel
Listening devices (aka: 'bugs') are said to be vulnerable to the playing of sound or music from other sound producing devices (TV's - radio - players - etc) but I cannot assure that this is 100% correct.
needles
An electronic listening device designed to be used in a briefcase or small bag.
The audio output of this device is stereo, providing sound through two channels for a more immersive listening experience.
It was Lewis Nixon who invented the very first sonar-type listening device in 1906.