Espressif ESP-WROOM-02 2.5 to 3.6V WiFi Module, 802.11b, 802.11g, 802.11n GPIO, HSPI, I2C, I2S, IR, PWM, UART
11b, 802.11g, 802.6V WiFi Module, 802.11n GPIO, HSPI, I2C, I2S, IR, PWM, UART, Supported Security Standards: WPA, WPA2, Dimensions: 18 x 20 x 3mm, Length: 18mm, Maximum Operating Temperature: +85 °C, Minimum Operating Temperature: -40 °C, Width: 20mm.