Component Desktop host computer with audio processing function and USB function control, indicator lights and buttons Built-in large capacity lithium battery Bluetooth 5.0 Size Diameter 120mm Height 39.5mm Net weight 252g Color Carbonite Grey Connector USB 2.0 （compatible with USB 1.1） Microphone Omnidirectional microphone Audio bandwidth 100～16KHz Sensitivity: -38dB 94dB Signal to noise ratio: 65dB 94dB , A-weight Speaker 2 inch antimagnetic speaker 4Ω5W Power supply USB bus power supply (5V500mA) Built-in lithium battery power supply (2000mA) Computer system requirements (USB) Windows 8 / Windows 7 / Windows 10/mac OS, etc Mobile phone operating system (Bluetooth) Android, IOS Indicator Mute microphone` Volume up/down adjustment Bluetooth wireless communication Button Bluetooth key (icon status) Microphone mute button Volume up button Volume down button Switch button (when a call comes in, short press to answer or hang up; long press to switch) Product Performance Standards YD/T 993-1998 GB/T 9254-2008 GB 4843.1-2011 LED status indicator Normal work: the green light always on Speaker mute: flashing green Mute microphone: red light always on Volume adjustment: indicator light flashes Low power: orange indicator light flashes Indicator red light always on: charging, the red light goes out after full Environmental requirements Temperature: 5°～44° Humidity: 20～85% (no condensation) Noise level: <48db Storage temperature: -10°～55°