Esp32wroom is a small-sized ESP32-based chip microcontrollers with integrated Wi-Fi & dual-mode Bluetooth.  Its application are Universal low power IoT sensor hub, Home automation, Universal low power IoT recorder, Baby monitor, Smart socket, Sensor network and many more. It has on- board PCB anteena with high level of integration and ultra low power management.

The NodeMCU Ch304 is an open source LoT platform which includes firmware based on ESP8266.It is an open source using Lua script language with WI-FI enabled. It uses many open source projects, such as lua-cjson and spiffs. . It comes with  CH340 chip  as Serial to USB interface. It is integrated with TCP / IP protocol stack.

The NodeMCU CP2102 is an open source LoT platform which includes firmware based on ESP8266.It is an open source using Lua script language with WI-FI enabled. It uses many open source projects, such as lua-cjson and spiffs. It has features like Plug and Play with USb-TTL , reset and flash button.

ESP8266 Wi-Fi module is   a complete and self-contained Wi-Fi networking solution serving as a Wi-Fi adapter, wireless internet access can be added to any microcontroller-based design with simple connectivity through UART interface or the CPU AHB bridge interface. It includes the antenna switch balun, power management converters. It can be used for Baby monitors, smart power plugs, mesh networks and many more.

Esp32 With 18650Battery Holder has 4 LEDs that show the battery status in real-time. It has a power button to start by clicking once. Navigation button changes (IO34, IO35, IO39)2A self-recovery fuse battery connection reverse protection.

This device has a 4MB flash. It also has lithium battery interface too. The maximum charging current of this device has 500mA . It also has a Bluetooth development board feature.WI-FI module is also included in this device.