Plantronics Voyager Edge Wireless and Hands-Free Bluetooth Headset with Charging Case, White (International Version) BLUETOOTH 4.0 HEADSET: Signature Plantronics audio technology coupled with enhanced voice clarity through Bluetooth 4.0 and wideband audio support. please note: the default english is with a UK accent. SMART SENSOR TECHNOLOGY: Our technology senses when the headset is being worn so it can automatically answer calls as you place the headset on your ear or redirect audio to your phone when you set down your headset. VOICE RECOGNITION: Manage calls hands free without pressing buttons through Plantronics voice recognition technology, just say Answer or Ignore. FIND MYHEADSET: The app will locate your headset through your iPhone, iPad, Android, or other smart device by sending a tone so you can hear where it is hiding. COMFORTABLE HEADSET: Three optional eartips, Connectivity technology: Bluetooth 4.0 small, medium, and large, for the most comfortable fit in either ear.