【Wide Battery Compatibility】Supports testing various batteries, including D, C, AA, AAA, 9V, button batteries, 21700 lithium batteries, 18650 lithium batteries, and 16340 lithium batteries 【Accurate Power Measurement】Delivers precise and fast measurement of remaining battery capacity, ensuring reliable results 【Digital Display Screen】Equipped with a clear digital display for easy and straightforward reading of battery power levels 【User-Friendly Design】Simple and intuitive to use, perfect for quickly checking battery status for a range of devices 【ABS Material】Insulation ABS material, anti-drop and durable 【Easy to Use】Corresponding to the positive and negative electrodes, put in the battery, display the battery power, operate simply Specifications: Display mode: digital display Power supply: no power supply required Product size: 3.90*9.45*1.8cm Material: ABS plastic Testable batteries: D battery, C battery, AA battery, AAA battery, 9V battery, button battery, 21700 lithium battery, 18650 lithium battery, 16340 lithium battery