Easy to find charging problems on digital devices. Press the small circle button and the data will then be the next data zero that you can test. Capacity: 0-19999 mAh. > With LCD screen that can easily display the current and voltage of the device. High-precision current, high voltage and low voltage calibration function Easy to find charging problems on digital devices Press the small circle button and then the data will be the next data zero that you can test Capacity: 0-19999mAh With LCD screen that can easily display the current and voltage of the device High-precision current, high voltage and low voltage calibration function Delivery quantity: 1 piece Product color: white Product size: 5.8 * 2.7 * 1.9 cm Note: manual measurement, please allow an error of 1 - 3cm!Yeuri