"Description: Quickly test your battery health in seconds. Has a movable arm to hold the battery. Test different sizes of batteries in one unit. If you don't know which battery to store, this device does work. The battery measures as 1.5V, AA, AAA and 9V, it can be measured with sufficient power, and the pointer directly displays the measurement result. Display color introduction: Red (RE -PLACE): Indicates here, the battery needs to be replaced or recharged, i.e. the battery is hardly used. Yellow (BAS): less power, but can also be used for some appliances. Green (GOOD): Enough How to use: 1. Use a 9V battery to directly connect the tester sockets on both sides, please pay attention to the positive and negative Polarity. 2. 1.5V, AA and AAA batteries, unfold the test arm on the top of the tester, put the battery in place, please pay attention to the positive and negative poles. Features: Product Name: Battery Tester. Material: Plastic Color: Black Size: 5x5x3cm< /p> Note: - There may be a slight size error due to manual measurement. - Color deviation may be due to different monitor settings Please understand. Packing List Package includes: 1 x battery Tester"