Never miss a call-It's called a stereo portable handsfree because it's for more than listening. A microphone, call answer key, 3.5 mm jack to swap headphones are all built in. Wireless music streaming-With A2DP you can stream high-quality stereo music from your phone to your wireless headset or other Bluetooth¿ devices. Superior sound-Each element of a Sony Ericsson music accessory is designed for best audio performance. Clear sound, deep bass and better performance as standard. Compatibility-All Sony Ericsson wireless devices have been developed in coordination with Sony Ericsson mobile phones, but are also compatible with Bluetooth¿-equipped handsets from other manufacturers. Adaptive Frequency Hopping (AFH)-AFH reduces the impact of interference between wireless technologies, resulting in excellent audio quality.