ITEM NAME:Micro USB Wemos ESP32 18650 Battery Shield V3 ESP-32 LED for Arduino RaspberryLJ Features: Battery protection(Over charge or Over discharge) Micro USB port Input Type-A USB Output 0.5A current charging 1 Switch control USB output 5~8V Input Voltage 3V & 1A Output 5V & 2A Output LED indicate(Green means full,Red means charging) 3V output port x3 5V output port x3 Be careful of "+" and "-", You should follow the direction of "+""-" on the PCB. Size: 9.8x2.9cm/3.86x1.14inch Package include: 1 x Battery Shield Module ( Battery Not Included ) Note: 1.Please allow 1-5mm error due to manual measurement..This product does not include 18650 battery. Micro USB port Input. 1 x Battery Shield Module ( Battery Not Included ). Type-A USB Output. Be careful of "+" and "-", You should follow the direction of "+""-" on the PCB.