1. Introduction Bluetooth Headset BTH-70 /BTH-850 is a portable hand free headset solution based on CSR Bluetooth wireless technology. The design is developed based on CSR Headset Pioneer Program reference design with bluecore02-Headset Extra chipset. Uses Class 2 Module BCM-04 Specifications Operating Frequency Band 2.4GHz~2.48GHz unlicensed ISM band Bluetooth Specification V1.1 Support Profiles Headset&Handsfree profiles Output Power Class Class 2 Battery Used 041730-150mAh(Rechargeable Lithium Polymer) Battery Voltage 3.7Vdc Charger 5.0V-5.8V(typ.300MA) Talk Time 4 hrs Standby Time 160 hrs Battery Charging Time 2 hrs Range of operation Max 10m line of sight Visual Indication 2LEDs (Blue and RED) Number of Operating Buttons 1 Buttons for Multi Function and 2 Button Volume Control Dimension BTH-70 7.1 x 2.1cm / BTH-850 6.3x2.6cm Net Weight BTH-70 22G / BTH-850 15G