Features: Built-in unidirectional microphone which can be twisted discretionarily picks-up your voice loud and clear.  Reduces unwanted background noise for clear conversation.  Great choice for public speak, Online courses, call center, conference calls, webinar presentations and more With USB plug connection, you can use the USB plug with control box to work with PC Convenient inline volume switch and Mic/Speaker mute for easy access, a built-in noise-reduction sound card of the control box lower noise output from devices.  Specification Material: PVC Color: black Size(L x W x H): about 165 x 130 x 60 mm Speaker size：30mm Sensivitity：105dB Impedance: 32 Ω Frequency range：20 Hz-20KHz Microphone：6.0 x 5.0mm Microphone sensitivity：38db Directionality：omni-directional Headset jack：USB Cable length： 1.8M(USB) System support： Win 7/Win8/Win8.1/Win 10/XP Package included: 1pc x Computer Headset Notice: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow 0.5-2cm differences due to manual measurement.