NodeMcu V3

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ESP chip version: ESP-8266EX (ESP12F?)
Flash size: 4M
Onboard USB-TTL converter: yes:
GPIO's broken out/available to free use:
GPIO tied to onboard hardware (like relay, button, LED on a standard sonoff)
Power supply information: ??
Antenna: onboard PCB antenna

Size comparison between V2 and V3:

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