Headphone Amplifiers descriptions： We use high-quality raw materials, all materials are very suitable for the product, please rest assured to buy. Electret Microphone Amplifier Module. Features: Add an Ear to Your Project with This Well-designed Electret Microphone Amplifier. This Fully Assembled and Tested Board Comes with a 20-20KHz Electret Microphone Soldered On. For the Amplification, We Use the Maxim MAX4466, an Op-amp Specifically Designed for This Delicate Task The Amplifier Has Excellent Power Supply Noise Rejection, So This Amplifier Sounds Really Good and Isn't Nearly As Noisy or Scratchy As Other Mic Amp. This Breakout is Best Used for Projects Such As Voice Changers, Audio Recordingmpling, and Audio-reactive Projects That Use FFT. On the Back, We Include a Small Trimmer Pot to Adjust the Gain. Specifications: Compatible Audio & Video Equipment Style: Earphones & Headphones Model Number: MAX4466 Electret Microphone Amplifier Bundle: Bundle 1 Dimensions (WxHxD)): Mini Weight: 10g Package: No Model: GY-MAX4466 Type: Audio Microphone Amplifier Board for Arduino . Products number : SOMONO94877