★ Working Voltage:DC 3V-5V ★ The SSM2167 is a low-voltage,low-noise mono microphone preamplifier,for ideal for low-power signal chains.This preamplifier includes a built-in compression and noise gate,For this function,it is better than just using an op amp in the preamplifier circuit ★ Size:2.2x1.5cm/0.87x0.59inch ★ Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid ★ Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!