The MOTORMOUTH III Hands free calling and bluetooth audio car kit plugs directly into your vehicle's aux input allowing for hands free phone conversations through your vehicle's speakers. The unit's voice announced caller ID says the number of the person calling. You get one touch voice dialing using most Bluetooth cellular phones and Siri voice commands are available through iPhones. DPS echo cancellation feature ensures a crystal clear conversation even in noisy vehicles. The MotorMouth III is 2.1 Bluetooth compliant and supports profiles HFP and A2DP. The unit will run wirelessly for roughly 6 hours between charges and the included charging port offers you another USB charging port in your vehicle. This bluetooth audio car kit opens so many hands-free wireless possibilities in any car with just and aux port.