This item is a universal battery checker tester AA AAA C D 9V and button cell battery. With it you can easily get the current volt of the tested battry, and know which batteries to keep and which to throw away, place your battery between the two points of the battery tester, and the pointer display will indicate that whether there is a battery need to be replaced. Great tool to check power level of 9V batteries. Features - Color: Silver - Material: Plastic - Size: 9.2x6.3x1.4cm - Three color indicates three different results: Red=Replace, Yellow=Low power, Green=Good. - Easy to read, colour coded meter indicates different power level. - Portable, easy to use. Just place your battery between the two points of the battery tester, and the pointer will display the result. - ABS insulated plastic shell, light and convenient, easy to use. - With it you can easily get the current volt of the tested battry, and know which batteries to keep and which to throw away.