Description:Special design for chatting over QQ， MSN， SKYPE and aiming over internetHigh quality mic， perfect voice recorderHigh-performance microphone accurately reproduces soundPlug in， and start recording-no extra gear neededUSB plug works with any USB-equipped computer3.5 stereo plug fit for all kinds of PC. Noisy cancellationSpecification:MODEL ITEM:SF-555B USB PLUGSensitivity: -47dB±4dBDirectivity: Noise cancelingImpedance: ≤2.2KΩSensitivity reduction: Within -3dB at 1.5VOperation voltage: 4.5VStandard operation voltage: 1.5VFrequency Response: 100Hz-16KHzS/N ratio: More than 67dBCord length: 1.5 metersPackage includes:1 x USB 2.0 Computer Studio Condenser Microphone SF-555B