Uses CP2102
NodeMCU has built-in USB-TTL serial with reliable industrial strength CP2102
CP2102 provides superior stability on all supported platforms
Communication interface voltage: 3.3V
Antenna type: Built-in PCB antenna is available
Wireless 802.11 b/g/n standard
WiFi at 2.4GH z, support WPA / WPA2 security mode
Support STA/AP/STA + AP three operating modes
Built-in TCP/IP protocol stack to support multiple TCP Client connections (5 MAX)
D0 ~ D8,
SD1 ~ SD3: used as GPIO, PWM, IIC, etc., port driver capability 15mA
AD 0: 1 channel ADC
Power input: 4.5V ~ 9V (10VMAX), USB-powered
Current: continuous
transmission: 70mA (200mA MAX), Standby: <200uA
Logical current: 0mA-36mA
Transfer rate: 110-460800bps
Support UART / GPIO data communication interface
Support Smart Link Smart Networking
Working temperature: -40 Cel. ~ + 125 Cel.
Drive Type: Dual high-power H-bridge driver
ESP8266 has IO Pin
Don't need to download resetting
A great set of tools to develop ESP8266
Flash size: 4 MByte