Add description for Issue #709.

Author: geerlingguy

_hats/waveshare-pcie-m2-e-key.md

@@ -8,4 +8,8 @@ github_issue: "https://github.com/geerlingguy/raspberry-pi-pcie-devices/issues/7
 link: "https://amzn.to/43m4sAC"
 videos: []
 ---
-TODO
+The PCIe to M.2 E-Key HAT+ HAT is intended for WiFi and Bluetooth cards, like the Intel AX210, or the BE200.
+
+The HAT comes with antenna cables, two external SMA antenna jacks, mounting hardware, and a USB A to C adapter board so Bluetooth functionality can be used through the E-key slot for E and A+E key cards.
+
+More info and Driver setup instructions for popular WiFi cards is located [on Waveshare's Wiki](https://www.waveshare.com/wiki/PCIE_TO_M.2_E_KEY_HAT+).