Specification:

• Embeded ESP8266-12F with PCB antena
• Flash: 4MB
• Wi-Fi in standard 802.11 b/g/n
• WiFi modes: AP (Access Point), STA (Standalone), AP+STA
• Supports TKIP, WEP, CRC, CCMP, WPA/WPA2, WPS
• Supply voltage: 3.3V (or 5V via USB)
• CPU: RISC 80MHz (supports up to 160MHz)
• 9 GPIO - PWM / I2C / SPI / 1-Wire
• Max current on I/O pins: 12mA
• Recommended current on I/O pins: 6mA
• USB-UART converter - CH340
• ADC - 10-bit
• 16 pins in 2,54mm raster - breadboard compatible
• micro USB B
• Size: 34 x 25mm
• LED connected to GPIO2 (D4)