The Xemics' AudioBlue 2 reference design is for the development of an ultra low power Bluetooth headset. The small form factor reference design targeting the cell-phone headset market is based on XEMICS' XE1431 Bluetooth application MCU and the CX72303 radio. The Audioblue2 is designed for a Li-ion or Ni-MH rechargeable battery, and provides up to 10 hours talk time with a 120 mAh capacity. It includes both hands-free and headset profiles and supports numerous features to answer, terminate, pick up, reject, or place a call, to control volume, to activate the phone's voice recognition, to redial the last number, to put calls on hold or toggle, and to connect two calls. The distance between the handset and headset can be up to 10 meters. It has multi purpose push-buttons for control, as well as LED indicators.