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Table 16 ESP8266-01 specifications

From: Building an indoor air quality monitoring system based on the architecture of the Internet of Things

Module Model ESP8266-01
  Master chip ESP8266
Wireless parameters Wireless standards IEEE 802.11b
IEEE 802.11 g
IEEE 802.11n
  Frequency range 2.412–2.484 GHz
Hardware parameters Hardware interface UART, IIC, PWM, GPIO, ADC
  Operating voltage 3.3 V
  GPIO drive capability Max: 15 mA
  Operating current In continuous transmission →
Mean: ~ 70 mA, peak: 200 mA
In normal state →
Mean: ~ 12 mA, peak: 200 mA
Standby state: < 200uA
Software parameters Wireless network classification STA, AP, STA + AP
  Security mechanism WEP, WPA-PSK, WPA2-PSK
  Networking protocol IPv4, TCP, UDP, FTP, HTTP
  User configuration AT order set, Web page Android/iOS terminal, smart link intelligent configuration APP