This excerpt taken from the NOK 6-K filed Feb 3, 2006.
Nokia Bluetooth Headset BH-900
Nokia Bluetooth Headset BH-900 is an elegant headset with a comfortable and ergonomic earhook that can easily be switched from one ear to the other. It has excellent audio quality even in noisy environments as it supports both noise reduction and echo cancellation. With talk time of up to 8 hours and up to 180 hours of stand by time, the Nokia Bluetooth Headset BH-900 presents a wireless solution even for long-lasting communications needs. The headset weighs 18 grams and supports Push to talk over Bluetooth wireless technology.