1): Wide Input Range This product AD620 zoom, you can zoom microvolts mV, more accurate than the market LM358 amplification, better linearity. 2): magnification using potentiometer amplify the input signal, magnification up to 10,000 times, can be adjusted only via a potentiometer. 3): Wide power supply range 7-24V DC power supply can be entered Performance: -Wide supply voltage range: 7-24V input -Ultra-low input offset voltage: 50μV maximum. -Ultra Low Input Bias Current: 1.0nA (maximum). -CMRR: 100dB -Ultra-low input offset voltage drift: 0.6μV / (maximum). -Ultra-stable, time: 2μV / month maximum