A headset is a headphone combined with a microphone. Headsets provide the equivalent functionality of a telephone handset with hands-free operation. Headsets typically have only one speaker like a telephone, but also come with speakers for both ears. They have many uses including in call centers and other telephone-intensive jobs and for personal use at the computer to facilitate comfortable simultaneous conversation and typing. The microphone arm of headsets may carry an external microphone or be of the voicetube type. External microphone designs have the microphone housed in the front end of the microphone arm, inside a microphone capsule. Voicetube designs are also called internal microphone design, and have the microphone housed near ear-piece. The sound travels through the tube to the hidden microphone.
Telephone headsets connect to a fixed-line telephone system. A telephone headset functions by replacing the handset of a telephone. All telephone headsets come in a standard 4P4C commonly called an RJ-9 connector, Computer headsets generally come in two connecting types, standard 3.5 mm & UB connection. General 3.5 mm computer headset comes with two 3.5 mm connectors, one connecting to microphone jack (line-in) and one connecting to speaker jack (line-out) of the computer. 3.5 mm Computer Headsets connect to the computer via a soundcard - which converts the digital signal of the computer to analog signal for the headset. Mobile (Cellular) Phone Headsets are most often referred to as Mobile Handsfree. Most mobile phones come with their own handsfree in the form of a single earphone with a microphone module connected in the cable. However, as music-playing mobile phones are becoming the norm, most manufacturers will bundle stereo earphones with a microphone for MP3 listening. There are brands which offer mobile headset outside of the mobile phones developer.
Wireless headsets are quickly becoming a new trend for both business and consumer communications. There are a number of solutions for wireless, and they usually differ according to application and power-management.