This product use micro usb DC 5V input, output 4.20V, accurate to 0.02V, charging current 0.5A-1.0A can be switched. It can charge 16340 , 14500, 18650, 26650 and other 3.7V lithium batteries. The LCD screen accurately displays the amount of electricity, charging percentage, real-time battery voltage and charging current, all of which are clear at a glance.