MakerFocus 4pcs Dual USB 5V 1A 2.1A 18650 Battery Charger PCB Module Board For DIY Power Bank

Descriptions:Charge indication: IN letters will appear on the charging display.Output load indication: After the load is connected, long press the LED light button, the output starts, the display will appear OUT letters and relative output voltage and current 5V1A or 5V2.1A.Protection function: The protection circuit of the boosted lithium battery has been integrated to prevent over-discharge, over-charge, and overload.Can receive a section of lithium battery can also be connected in parallel multi-section lithium battery.The capacity does not exceed 200,000 milliamps and the voltage of 3.-4.2V can be used.Lithium positive electrode B+ lithium negative electrode B-.Features:Size: 58MM*27MM*15MM.Input Port:micro USB Input Power Supply: DC 5V Output Power Supply: DC 5V 1A 2.1A Power Conversion:85% protection:overcharge protection,overdischarge protection, short circuit protection,over current protection,over temperature protection Power Capacity Display:0-100%Note: 1. The B+ and B- conne