Digital AA AAA Button Cell Battery Tester Voltage Checker with LCD ScreenFunction: Checks power level of all 1.5V & 9V batteries (battery do not included)This is a Digital Battery Voltage Tester，by test the voltage of the battery，you can judge the power of the battery convenient.Red Light: No power， please replace the battery or recharge it.Yellow Light: No enough power，just can be use on some of the devices.Green Light: Enough power for use.Main Features: - Easy to read， color coded meter indicates power level - Test different sizes of batteries in only one unit - Portable handheld design - Perfect companion for travel - Test the capacity of your battery in seconds - One movable arm to accommodate the battery - Tests 1.5V miniature cellsThree result: - Red=replace - Yellow=low power - Green=goodCompatible with: - 1.5V AAA， HP 16， MN2400， R03 - 1.5V AA， HP7， MN1500， UM3， C， HP11， MN1400， SP11， LR14， UM2， D， HP2， MN1300， SP2， R20， UM1 - 9V PP3， MN1604， 6F22， 006PColor: blackDimensions: 108*60*26mmNet Weight: 65gApproved: CE/FCCNote: If the lights did not show check that battery is touching both contacts， otherwise the battery is completely dead.