All the sensors used 4 pins connector
The kit include LinkNode D1 whihc based on ESP8266 WiFi chip
LinkNode D1 is Arduino compatible WiFi development board with arduino headers, support arduino-IDE for programming.

Technical Details

Product Details

Package Dimensions
Width : 2 inch
Height : 1 inch
Length : 2 inch

Shipping Weight: 4.8 ounce (View shipping rates and policies)

ASIN : B01MZ3HC84