*** DISCONTINUED *** The Discovery 645 incorporates the same style and design as the internationally-acclaimed Discovery 640, and now includes digital signal processing (DSP) for crystal clear communications. Weighing less than two nickels, the Discovery 645 is extremely discreet and lightweight. The Primary Features of the Discovery 645: DSP offering transmit noise reduction and echo cancellation Bluetooth 2.0 Headset/Handsfree Profiles Voice feedback using sidetone Ultra-lightweight and comfortable Discreet, in-ear design weighs less than 10 grams Fashionable, with high-end materials and finishes Up to 3 hours talk time and 120 hours standby time Multiple charging options: AC adapter, AAA battery adapter and Mobile phone adapters