MoGo Talk XD Bluetooth Headset and Protective Case for iPhone 4 (Black) (Fits AT&T iPhone) Exclusive custom designed iPhone 4 case with integrated Mogo Talk XD headset Talk time up to four hours with standby time of three days SmartAudio speech enhancement for clear crisp calls SoundShape eartip design blocks up to 15dB of ambient noise and provides a comfortable customizable fit SoundMonitor balanced armature driver technology