Microcontroller:atmel atmega32u2
Wireless chip:esp8266 SRAM:2.5K EFPROM:1K
Operating Voltage:3.3V Flash Memory:32KB(of which 4KB used by bootloader)
Clock Speed:8MHz Connectivity:wifi, micro-usb,serial,i2c,SPI
Built-in ESP8266 WIFI module(ESP-03)

Technical Details

Size (LWH): 0.4 inches, 0.4 inches, 0.4 inches
Product Details
Product Dimensions: 0.4 x 0.4 x 0.4 inches
Shipping Weight: 0.02 pounds (View shipping rates and policies)
ASIN : B012EV3D2E