Practical: simply check the current battery status - very suitable for determining whether the battery is used in the drawer, etc. can quickly measure the battery voltage and display the test result. Flexible use: suitable for AAA, AA, C, D, 9V and other types of batteries - There are two points different contact points on the device, for the measurement 1.5 V + 9 V batteries can be used Usage is simple: insert the battery in the direction of polarity - read - it is ready. - slider adaptable to different battery sizes - three-color simulation gives clear results - no additional power required Easy to read: portable design is easy to read. No batteries necessary: the battery tester is activated by the battery to be tested and can operate without batteries. Test battery life anytime and anywhere. Product advantages: No power supply, can quickly judge 1.5V, whether the 9V battery power is enough, small and convenient to carry Product Features: Battery measurement of 1.5V5, No.7, 9V square battery, can measure whether the battery power is sufficient, the pointer directly displays the measurement result The color instructions of the head are as follows: Red (recoat): If the indicator refers to this block, the test battery needs to be replaced or recharged, that is, the battery is essentially not available. Yellow (low): The battery is very small, but some electrical devices can be used. Green: The battery electricity is sufficient. Notice: The tester battery is activated by the registered battery. Turn the test time as much as possible to avoid unnecessary battery consumption. Color: black Note: excluding AAA batteries Contents of the package: 1 x battery tester Color: black Delivery quantity: 1 piece