Headphones are a pair of small loudspeakers that are held close to a user’s ears with a headphone connector or with in-ear connectors. The headphones are connected to a signal source such as an audio amplifier, radio, CD player or mobile device. Headphones are also known as earphones, earbuds, stereophones, or headsets.
In the context of telecommunication, the term headset is used to describe a combination of headphone and microphone used for two-way communication, for example with a telephone.
Private investigators may use headphones during the course of a surveillance mission, especially in relation to the use of audio surveillance equipment and listening devices. Private investigators often need to listen to conversations from a distance, so electronic listening devices and headphones are often used.
In addition, private detectives often use head sets to keep their hands free when conducting surveillance. This allows a private eye to operate other devices simultaneously, such as a video camera, binoculars, night vision goggles, or camera.
Private investigators may also use various types of headsets or earphones that are designed to work with various types of spy gear. Some anti-bugging or bug detection devices are designed to work with earphones that allow the user to listen to electronic signals. This aids the user in detecting hidden electronic devices, also known as bugs, by hearing changes in frequency signals.
If you’re a private eye, you should have a quality telephone headset or earbuds in your library of spy gear.