Small and convenient: small and simple but efficient AA, AAA (BT-168D) battery tester, small in size, light in weight, and easy to carry. Wide range of applications: It can test different types of household batteries such as button type AA, AAA, C, D, 1.5V, 9V, 1.5V, etc. No power required: This battery monitor can do all this. The easy-to-read analog display pointer moves to quickly identify "good" (green), "low" (yellow), and "replace/charge" (red) battery status. This universal battery tester is excellent in emergency situations and is powered by the battery it tests. Easy to read: The number indicates the power level. No battery is needed. It is activated by the checked battery. The quality of the battery power tester is guaranteed: we hope you can make full use of the home battery tester! Product description Product Features: Easy to read. Quickly test the battery level. Compact size and lightweight design. Self-powered, no built-in battery required. Test multiple sizes of batteries in one unit. Check the power of the 9V and 1.5V batteries. Specification: 1.5 V: AAA, HP6, MN2400, RO3, AA, HP7, MN1500, HP11, MN1400, UM2, D, HP2, MN1300, UM1 and button batteries. 9V-PP3, MN1604, 6F22, 006P Red = Replace Yellow = low power consumption Green = good Comments: The battery tester is started by the tested battery. Keep the test time as short as possible to avoid unnecessary battery consumption. If the LCD screen does not appear, please check if the battery is touching the two contacts before you think it is completely dead. AAA batteries are not included. The package contains: 1 x battery tester (not including battery)