Features:1. Design: Omni-directional microphone design, the call is as clear as face-to-face.2. Wearing left and right ears: 180°rotating left and right ears without pain, voice broadcast in Chinese and English, and call broadcast.3. Speaker: 10mm composite diaphragm speaker, translucent treble, strong bass.4. Large-capacity battery: long-lasting battery life and long standby time of 180 days, and the continuous talk time is about 36 hours.5. Elimination: Built-in DSP noise suppression and echo cancellation function (CVC8.0 dual noise reduction technology).Description:This product is a headset with an omnidirectional microphone design, making calls as clear as face-to-face.Specifications:Working voltage: 3.7VCharging voltage: DC5V?Charging Time: about 1 hoursTalking time: about 20 hoursMusic time: about 15 hoursStandby time:about 480 hoursFrequency response: 20 - 22kHzTransmission range: 5 metersSize:75*55*13mmPackage Included:1pair*EarphonesNotes:1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.