Working Voltage: DC 3V-5V The SSM2167 is a low-voltage, low-noise mono microphone preamplifier ideal for low-power audio signal chains. This preamplifier includes built-in compression and a noise gate, which provides better performance compared to using a standard op-amp in the preamplifier circuit. The dynamic range compression reduces peak signal levels while adding additional gain to low-level signals. The noise gate attenuates signals below a certain threshold, allowing only the desired signal, such as speech, to be amplified and reducing background noise in the output. These features help improve the clarity of the voice signal received by the microphone. Size: 2.2 x 1.5 cm / 0.87 x 0.59 inch Note: Please allow 1-3 mm error due to manual measurement. Please ensure you are comfortable with this before purchasing. Due to differences between monitor displays, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x SSM2167 Microphone Preamplifier Board