ESP-01 wi-fi module
802.11 b/g/n
Serial/UART baud rate: 115200 bps
Integrated TCP/IP protocol stack
Input power: 3.3V (see “Recommended Accessories” below for 3.3V power options)
I/O voltage tolerance: 3.6V Max
Regular operation current draw: ~70mA
Peak operating current draw: ~300mA
Power down leakage current: <10µA +19.5dBm output in 802.11b mode Flash Memory Size: 1MB (8Mbit) WiFi security modes: WPA, WPA2 Module's dimensions: 24.75mm x 14.5mm