Battery Level Indicator Module 12V (XD-82B)

From the shop's description

This module is ideally suited to monitoring the status of a 12V battery. Through clever use of a series of resistors and the LM339 comparator, a visual indication of the state of a battery can been seen. As the battery depletes and the voltage begins to fade lights will begin to go off. This battery level indicator offers four LEDs that light up progressively as the voltage increases: Red: Representing 20% Yellow(1): Representing 50% Yellow(2): Representing 80% Green: Representing 100% Specifications On-Board Precision Voltage detection Chip and Power Regulator Chip Set aside all the way to installation of Battery testing interface and two Positioning Holes Special Function: Common Point Contact Diode Colour: Blue Minimum Operating Temperature: -40°C Maximum Operating Temperature: 85°C Soldering Points: 2pin Input DC Voltage: 12V Chipset: LM339 Pin Pitch: 2.54mm Dimensions: 22x17x8.2mm Mounting: 2 Holes 2.4mm Document: LM339 Datasheet