Specification Brand : Yosoo BulletPoint1 : [ADJUSTABLE AMPLIFICATION] - Control the microphone's gain from 20x to 200x, allowing for precise adjustment of the audio sensitivity. BulletPoint2 : [USER-FRIENDLY] - Simply connect the module to your electret microphone and a 3.3V power supply for easy and hassle- . BulletPoint3 : [ AUDIO] - With power supply noise suppression, this amplifier module ensures clear and distortion- audio reproduction. BulletPoint4 : [STURDY AND SCRATCH ] - Made of ABS material, this module is built to withstand impact and resist scratches for long-term use. BulletPoint5 : [BULK PACKAGE] - Receive 5 amplifier modules in one package, providing excellent value and convenience for multiple applications. ItemName : Electret Microphone Amplifier Module with Adjustable Gain LM386 20‑200x DC4V‑12V for Electret Microphone Use ItemPackageDimensions_Height : 2 centimeters ItemPackageDimensions_Length : 7 centimeters ItemPackageDimensions_Width : 3 centimeters ItemTypeKeyword : microphone-elements Manufacturer : Yosoo ModelName : Yosoo1fy48hnx2q ModelNumber : Yosoo1fy48hnx2q NumberOfItems : 1 PartNumber : Yosoo1fy48hnx2q ProductDescription : 1. FLEXIBLE AND ADJUSTABLE: LM386 power amplifier chip, magnification can be adjusted between 20 times and 200 times through the adjustable on the board, can directly drive small power horn, suitable for the use of electret microphone 2. EASY TO USE: Electret microphone amplifier module support GND grounding, VCC connected to 2.4‑5VDC; For good performance, use the quietest power supply available(this will be a 3.3V power supply) 3. POWER SUPPLY NOISE SUPPRESSION FUNCTION: The amplifier has good power supply noise suppression, working voltage support DC 4V‑12V 4. SCRATCH ABS: Microphone amplifier module adopt excellent ABS material, possess impact , scratch , 5. 5PCS IN TOTAL: The package contain a total of 5pcs amplifier module, enough for you to replace and use, very convenient