The Battery Voltage Sensor is a hand made from PCB offcuts (So color may vary) most will be black though since I'm phasing out my Arduino proto shields, The sensor can be switched on and off consuming almost no current on the off state showing as µA 0.2 on my BK precision multimeter, The sensor can be adjusted to your voltage setup and microcontroller logic level with the 220k potentiometer Warning!!! always adjust the device pry to attaching it to your board otherwise you will burn your microcontroller, The pinouts are as follows, The first pin on the far left of the image and also the one the red wire is soldered to, That attaches to the battery, Next is the ground, Than is the analog out, This is gonna go to your microcontroller's analog in, The last pin is IO toggle, This pin enables analog read when it is on, And turns everything off when it is off, Works with 5v and 3.3v logic level.