MST-A1S USB Video Conference Microphone Speakerphone 360° Audio Pickup Support Skype MSN QQ for Computer Mobile Phone Features: Built-in dual-condenser omnidirectional microphone pick up clear sound from 360° within 4m. Built-in 4Ω 3W speaker made you heard by everyone in a 5-10 people conference. Intelligent and efficient DSP chip can eliminate echo and reduce noise, guarantee sound effect. Support speaker mute, mic mute, Hi-Fi mode and volume control. Usable for Windows/Mac/iOS/Android; Driver free, Plug and play. Compatible for online communicating software such as QQ, MSN, Skype & more. Ideal for video conference, internet interview, online education, video call, etc. Specifications: Speaker Sampling Frequency: 24Khz~48Khz Mic Sampling Frequency: 16Khz   Speaker: 4Ω 3W USB Cable: DC 5V 500mA, 3 meters long Mic: Dual-condenser Omnidirectional Mic  -Sensitivity: -34 ± 3dB  -Frequency: 100~10,000Hz  -Impedance: ≤2.2KΩ  -SNR: ≥58dB  -Max. Sound Pressure Level: 95dB  -Max. Current Consumption: ≤0.5mA Echo Cancellation: Max. 256ms Reverberation Time: ＜0.5s Product Noise: ＜48dBA Audio Processing: AEC/AGC/NR/NLP/ALC System Environment: Compatible for Windows 8/7/VISTA/XP/2000, for Mac / iOS / Android Interface: 3.5mm Audio Input for Mic, 3.5mm Audio Output for Loudspeaker, Phone Audio Port, USB Port Item Size: 11.5 * 11.5 * 3.5cm / 4.5 * 4.5 * 1.4" Item Weight: 407g / 0.9Lbs Package Size: 27.5 * 24.3 * 9.8cm / 10.8 * 9.6 * 3.8" Package Weight: 896g / 2Lbs Package List: 1 * Conference Microphone Speaker 1 * USB Cable 1 * Audio Cable 1 * Quick Start Guide(English) Note: Computer and smartphone are not included.