A Bluetooth headset is a small device worn in, on, or around the ear to facilitate hands free communication between the wearer and the Bluetooth device. Most commonly, this device is a mobile phone – most modern mobile phones utilize Bluetooth. Some computers, vehicles, data storage devices, or other gadgets also use Bluetooth to let the user give hands free commands, listen to music, or otherwise communicate wirelessly. The standard Bluetooth headset for mobile phone use has both input and output, and it’s use is quite similar to that of a phone, but with limited buttons and options. http://reviews.cnet.com/bluetooth-headset-buying-guide/ http://www.howstuffworks.com/bluetooth.htm

A Bluetooth headset can not be used on its own for communication – it must be used in conjunction with another device, such as a cell phone, computer, or similar. Sounds and commands (such as button presses) are sent from the Bluetooth headset and used to control or otherwise utilize the receiving device. The device can then send audio or commands back to the Bluetooth headset to be received by the wearer. When using a mobile phone with a Bluetooth headset, often commands like “dial (number)” or “play voicemail” can be used to completely remove the necessity of using one’s hands. http://www.howstuffworks.com/bluetooth.htm