Along with the headphones, it's fully foldable, with advanced digital signal processing that includes echo cancellation and noise reduction. It has the typical multifunction button as well as music player controls and a volume rocker. The BH-504 has a rated battery life of 9 hours talk time, 7.5 hours music time, and 3.75 days standby time.and its promotion, Nokia also announced a slew of stereo headsets to match its new music-focused products on Thursday. The Nokia BH-504 is the only Bluetooth headset of the bunch, with the ability to handle calls as well as listen to music wirelessly. Looking a lot like regular over-the-ear
The other three headsets are of the wired variety, and all three have call management features. The WH-202 has ear clips for long-wear comfort and has a 2.5mm connector for cell phones with that headset jack, though it doesn't have music player controls. The WH-500 has a design similar to that of the BH-504, plus it has music keys such as play/pause and next/previous track and a 3.5 mm connector (as well as a 2.5mm adapter). Finally, the WH-800 earbuds come with adjustable ear hooks, a volume rocker, a carrying case, and a 3.5 mm connector plus a 2.5mm adapter.