Arduino UNO WIFI - DFRobot

Connecting the DFRobot Gravity ECG module to the Arduino Uno where

DFRobot SoC aids IoT design and prototyping - IoT M2M Council

WiDo - An Arduino Compatible IoT (internet of thing) Board - DFRobot

Gravity: IO Expansion Shield for Arduino V7.1 - DFRobot

Arduino UNO R4 WiFi Development Board - DFRobot

Arduino Gravity: WiFi IoT Module

DFRduino UNO R3 - Compatible with Arduino Uno - DFRobot

Arduino Uno - SMD Botland - Robotic Shop

SIM7600CE-T 4G(LTE) Arduino Shield - DFRobot

The Arduino UNO WiFi Rev.2 is the easiest point of entry to basic IoT with the standard form factor of the UNO family. Whether you are looking at

ARDUINO UNO WiFi REV2

WiFi Shield V2.2 for Arduino (802.11 b/g/n) - DFRobot