This module works with 802.11b, g, or n networks & supports WEP, WPA and
WPA2 encryption. You can use it in Soft AP mode to create an ad-hoc network.
For secure client connections, there is TLS 1.2 support! This version of the
shield comes with a uFL connector that can be used to attach external antennas.
If you want to keep it simple, check our the PCB trace antenna version.
These SPI-protocol WiFi module are currently the best way to add WiFi to your
Arduino-compatible so we've decided to make a handy shield for it. The shield
comes with level shifting on all the input pins so you can use it with 3V or 5V
logic boards. A 3.3V voltage regulator that can handle the 300mA spikes lets
you power from 3-5.5VDC. There's also 3 LEDs that you can control over the SPI
interface (part of the library code) or you can have controlled by the Arduino
library. They'll light up when connected to an SSID, or transmitting data.
We also tossed on a micro SD card socket, you can use that to host or store data
you get from the Internet. Arduino's based on the ATmega328 (like the UNO)
cannot use both the WiFi module and SD library at the same time, they're too
small. Upgrade to a Metro M0 Express to get a big memory bump!
TECHNICAL DETAILS
Product Dimensions: 68.0mm x 53.0mm x 4.7mm / 2.7" x 2.1" x 0.2"
Product Weight: 13.6g / 0.5oz
https://www.adafruit.com/product/3654 11-11-17