[ABS Material] This universal battery tester is made of insulated ABS plastic and is lightweight, compact, and easy to use. It is activated by the battery being tested and no other batteries are needed. [Battery Detector] This miniature battery detector can assess battery charge by detecting battery voltage, maximizing battery usage and reducing unnecessary waste. [High Compatibility] Can be used to test D-type battery, CN-type battery #5, type 7 battery, N-type battery, LR44 (1.5V button cell), 9V battery, 6F22. [LCD Screen] LCD screen battery indicator, red indicates that the battery needs to be replaced, yellow indicates that the battery is too low, green indicates that the battery is sufficiently charged. [More Tips] Pay attention to the positive and negative terminals of the battery when measuring. In addition, keep the test time as short as possible to avoid unnecessary battery consumption.