Top features: - High-powered drivers deliver crisp and clear sound at every frequency- Vibration mode notifies you when calls come in - Ergonomic earbuds for a comfier fit - Hands-free calling is easy with in-line remote High-powered drivers The 12.2 mm drivers packed into the Philips SHB4205BK Wireless Bluetooth Headphones deliver a high quality audio experience that deceive their compact size. Its bass tubes increase the airflow to give a rich, deep bass sound that holds its own, without distortion. Vibration mode Even if you're not listening to music on your SHB4205BK headphones, the neckband vibrates when worn to let you know when you're receiving an incoming call. Ergonomic earbuds Part of Philips' 'Hyprlite' range, the earbuds on your SHB4205BK headphones are designed to be so slim and light that, you'll barely feel them in your ears. Enjoy the tracks you love with in-ears that are surprisingly comfortable to wear.Hands-free calling The in-line remote control can play and pause music, and can be used to accept incoming calls. With 7 hours playback or talk time, the Philips SHB4205BK headphones are a handy alternative to answering calls directly on your handset.