In telephony, both wireless and wired headsets are used. Wired headsets can be fitted with various different connectors. In addition to RJ-9 or RJ-11 connections, they often come with manufacturer-specific connectors. Functions or the electrical characteristics, such as the impedance, can vary greatly. With mobile phones there are headphones that have a microphone and connector cable that are usually connected via a jack plug to the device, allowing them to be used as a headset. There is often a volume control attached to the cable.
Wireless headsets are powered by batteries, which may be rechargeable, and communicate with a base station or directly with the telephone via radio. A wireless connection to a mobile phone or smartphone is usually managed via the Bluetooth standard. Headsets that communicate with a telephone or headset base via the DECT standard are also available.
Professional solutions, whether wired or wireless, usually allow you to mute the microphone with the press of a button. Important criteria when choosing a headset include the voice quality, the capacity of the battery and the maximum talk and standby times.