Item Type: Microphone ModuleSensitivity: -26dB, dBFS at 1kHz, 1Pa. Sinal to Noise Ratio: 57dB, 20kHz bandwidth, A weihted. Connection Mode: 1 x 6P, 2.54mm interface. Total Harmonic Distortion: 2k. Clock Frequency: 1.0-4.0Mhz at normal mode. 150-800KHz at low power consumption mode. Hardware Features:External Power Supply Voltae: 3.3V 0.2VExternal Power Supply Current: >1mA1Microphone Module: Hih in sensitivity and low in noise, the hih performance MEMS microphone module is very stable and reliable. 2Reliable in Works: The frequency is adjustable, and the omnidirectional mic module has low power consumption and I2S diital output. 3Excellent Fittin: Applicable to MEMS microphone MSM261S4030H0, the mic module can work with the for Sipeed Maix development board. 4Includin 2 Sets: There are 2 sets microphone module in the kit, and this quantity will surely satisfy your needs for replacement. 5Simple to Install: Comes with a liht weiht and a compact size as well, the I2S mic board has pin header for easier installation.2 xMicrophone Module2 x Pin Header