"1. Disposable and rechargeable batteries with a voltage of 1.5V, including: 5 (AA), 7 (AAA), 1 (D or large), 2 (C or 2), AG series button cells, etc. 2, the voltage is 9V primary battery and rechargeable battery. From the position of the pointer, we can see the battery The power is: 1.""Insufficient Power"": GOOD-OK; 2 ,""Insufficient Power "":WEAK-battery is low; 3.""No Power"":REPLACE-battery needs to be replaced. Universal AA AAA CD 9V Coin Cell Battery Checker Don't guess which batteries to keep and which to discard, Place the batteries at two battery test points, The easy-to-read display will tell you instantly if there is a misfire, Or if you still get a few minutes of battery life. Check all 1.5 V and 9 V batteries for Battery level Easy to read, color meter indicates battery level Tested 1.5V micro battery Three results: red = replace, yellow = low battery, green = good If the pins don't move, check that the battery is touching both contacts before assuming It's completely dead. A battery tester can be used to test The following sizes: 1.5 V: AAA for HP16, MN2400, R03 AA, HP7, MN1500, UM3 C, HP11, MN1400, SP11, LR14, UM2 D, HP2, MN1300, SP2, R20, UM1 9V: PP3, MN1604, 6F22, 006P < p>Note: The battery tester is activated by the battery being checked. Keep the test time as short as possible to avoid unnecessary battery drain. Black< /p> Item size: 110* 59*25mm Note: AAA battery not included Package content: 1 x Battery Tester"