V8 Sound cardProfessional Noise Reduction Technology: Built-in Dual DSP Noise Reduction Chip and ECHO, There are dual DSP noise reduction chips inside the sound card voice changer to avoid the influence of current noise, ensure high quality sound, and sing beautiful songs. Reverb (ECHO) makes your voice more charming.High quality desktop recording is made simple just plug the usb microphone into you computers port, it even works automatically with your mac or pc. No drivers required.Folding design, it is portable and convenient.Specifications Output impedance: 30% ohm +/-Microphone output interface: 3.5 mmSignal to noise ratio: 78 dBmeters Frequency response: 20Hz-16kHzLoad impedance: over ohmic Current: 3 mAThe maximum value of the table clamp. Componentthickness: 45 mmSensitivity: -38dB +/- 2dB Equivalent noise: 16dBAOutput interface microphone: 3.5 mmMaximum length ofgooseneck popular filter: 370 mm.