Bluedio 66i combines Bluetooth 4.0 HD Audio, Low Energy Technology, Bluedio Original Composite Drive Unit and latest NFC technology, creates an excellent Bluetooth stereo headset. Perfect Business life,Perfect Bluedio 66i 1.Support NFC (Near Field Communication) 2.The perfect combination of Bluedio original composite drive units and Bluetooth 4.0 3. Support Multipoint Pairing and Compact Voice Command. 4. Bluetooth 4.0 low Energy technology Bluedio 66i owns longer working time 5.Support Bluetooth "EQ"Selection 6..Fashion and accurate Ergonomic speaker Design Bluedio 66i Technical Specification: Bluetooth Version: Bluetooth V4.0 Support Profiles: NFC A2DP AVRCP HSP HFP Standby Time: up to 400hrs Frequency Range: 2.4GHz-2.48GHz Operational Temperature: -10 to 50°C Operating Distance: Up to 10m (free space) Accessories: Bluedio 66i Bluetooth Headset 1pc USB Charging Cable 1pc Ear Cord 1pc Ear Hook 3pcs User Manual 1pc