2PCS H85 bluetooth Wireless Sport Neckband Earphone Dynamic Headset Built-in Mic BLACK COLOR Description Specification:Product name: bluetoothheadsetModel: H85bluetoothversion: bluetoothV4.2Battery capacity: 85mAhChannel system: StereoCharging time: about 2 hoursMusic duration: about 6 hours (80% volume)Call duration: about 7 hours (80% volume)Support bluetoothprotocol: A2DP V1.3, AVRCP V1.6, HFP V1.7, HID V1.1, AVCTP V1.4, AVDTP V1.4, SPP V1.2bluetoothworking frequency: 2.402GHz-2.480GHzTransmission distance: within 10 metersFeatures:1.Support to connect bluetoothdevices and support two-channel stereo high-fidelity music playback;2. Support bluetoothhigh definition call;3. Built-in Chinese and English intelligent voice prompts;4. Support IOS system headset power indicator and battery power broadcast function;5. Support 2 devices connected at the same time, one support two functions.