The NodeMCU is an ESP8266 WiFi based microcontroller board that helped overcome some of the difficulties associated with several versions of boards based on the ESP8266 WiFi module/chips from Espressif. As the popularity of Arduino boards increased, the demand for boards which comes embedded with some of the add-ons used with the Arduino increased. One of the most popular add-ons were the WiFi modules which are used to connect Arduino boards to the internet.

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Ultra-wide 4:1 input voltage range
High efficiency up to 91%
3I/O isolation test voltage 1.5k VDC
Input under-voltage protection, output short-circuit, over-current, over–voltage protection
Operating ambient temperature range -40℃ to +105℃
CISPR32/EN55032 CLASS A EMI compliant without external components
Input reverse polarity protection available with chassis(E2) or 35mm
DIN-rail mounting(D4) version
Industry standard pin-out
Meets EN50155 railway standard
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