Features Microphone Module: High in sensitivity and low in noise, the high performance MEMS microphone module is very stable and reliable. Reliable in Works: The frequency is adjustable, and the omnidirectional mic module has low power consumption and I2S digital output. Excellent Fitting: Applicable to MEMS microphone MSM261S4030H0, the mic module can work with the for Sipeed Maix development board. Including 2 Sets: There are 2 sets microphone module in the kit, and this quantity will surely satisfy your needs for replacement. Simple to Install: Comes with a light weight and a compact size as well, the I2S mic board has pin header for easier installation. Specification: Item Type: Microphone Module Sensitivity: -26dB, dBFS at 1kHz, 1Pa. Signal to Noise Ratio: 57dB, 20kHz bandwidth, A weighted. Connection Mode: 1 x 6P, 2.54mm interface. Total Harmonic Distortion: <1%, 100dB SPL at 1kHz S=Nom, Rload>2k. Clock Frequency: 1.0-4.0Mhz at normal mode. 150-800KHz at low power consumption mode. Hardware Features: External Power Supply Voltage: 3.3V ± 0.2V External Power Supply Current: >1mA Package List:2 x Microphone Module 2 x Pin Header Package List 2 x Microphone Module 2 x Pin Header