Reed Switch Module

SpecificationsWorking voltage: DC 3.3V-5VOperating temperature: -10 – +50 The 4 pins are G (GROUND), + (3-5VDC), DO(Digital Out), and AO(Analog Out).DO is a normally LOW output,if a magnet is placed near it, the pin goes to HIGH state.A0is a normally high analog value, change if a magnet place near it to low analog valueadjustable via potentiometer.