The ESP8266 module is a very popular WiFi module with serial interface. However, using it requires a number of circuits to implement externally: ? A regulated 3.3V power source that can deliver the require current for normal operation ? A level shifting circuit to allow 5V microcontrollers (e.g. Arduino Uno/Nano/Mega etc) to safely interact with the WiFi module ? A switch to temporarily allow flashing or firmware update The Kimat ESP-8266 Adaptor module implements all of the above making the WiFi module readily interfaceable with microcontroller boards including Arduino boards. The Kimat ESP-8266 Adaptor module is part of Layad Circuits? Kimat series of rapid-prototyping products.