【Wide Application】 Frelisiy universal battery tester can test many different types of batteries, and work with both standard and rechargeable household batteries. Works with all 1.5v batteries, AA, AAA, C, D, button cells, 1.2~4.8V and 9v batteries. 【Instantly Display】BT-168 and BT-168D does not need an additional battery to work, and it generates electricity from the battery under test. Battery power tester will display battery power instantly. There is not too much unnecessary battery consumption. 【Easy To Test】BT-168 will identify battery status simply by the display needle moves on a color coded, "replace/recharge" (red), "low" (yellow), and "good" (green). BT-168D has a LCD digital display, which visually display the volt of battery. 【Essental Household Tool】The battery checker can accurately identify the working state of the battery, which for families who need to use standard and rechargeable batteries to determine whether the battery can be continued or whether it needs to be recharged, thereby effectively avoiding waste. 【After-Sales Service】We value your shopping experience and are committed to providing you with excellent after-sales service. If you are not satisfied or there are any problems with the battery tester (missing or broken), please feel free to contact us for replacement.