Philips Premium Lightweight Wireless Bluetooth Extra Bass Noise-Isolating Stereo Headphones Bluetooth Wireless - Enjoy high quality Bluetooth audio streaming and simplified connectivity with Near Field Communications (NFC) technology 40mm Drivers - Newly-developed 40mm driver units deliver broad, balanced, and accurate sound reproduction for an exceptional listening experience Designed for Comfort - A lightweight, swivel design with pressure-relieving earpads provides long-term comfort and folds flat for portability Powerful Bass - Specially designed, powerful drivers deliver deep and powerful bass that perfectly complements today's popular music genres Long Battery Life - The built-in rechargeable battery provides up to 30 hours of continuous, wireless music playback. For hands-free calling, you can speak freely for up to 30 hours, or up to 300 hours of stand-by