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Main features of NodeMcu v3 (ESP-12E):

 Main features of NodeMcu v3 (ESP-12E):

support for WiFi protocols 802.11 b / g / n
Wi-Fi Direct (P2P), soft-AP
built-in TCP / IP stack
built-in TR switch, balun, LNA, power amplifier and network matching
built-in PLL, regulators, and power management system
output power +20.5 dBm in 802.11b mode
antenna diversity support
STBC, 1 × 1 MIMO, 2 × 1 MIMO
A-MPDU & A-MSDU aggregation & 0.4μs guard interval
wake up and send packets in up to 22 ms
Rated voltage: 3.3V
Input voltage: 3.7-20V
Maximum current consumption: 220 mA
Contacts of Wi-Fi module NodeMcu v3

The module has 11 general purpose I / O ports.

Some of the ports have additional functions:
D9, D10 - UART
D1, D2 - I²C / TWI
D5 – D8 - SPI
D1 – D10 - outputs with PWM (PWM)
A0 - analog input from ADC
Where to buy NodeMcu v3 (link):