Base Node MCU HW3891.This is a breadboard for the LOLIN NodeMCU Development Board ESP8266-12E for Arduino IDE see other listing 2.Please note this has a pin spacing of 28MM between the rows unlike the unit made by DOIT witch is 23 MM3.This is compatible with the LOLIN NodeMCU not the DOIT device 4. Compatible con NodeMCU CH340, no funciona con CP2102