\rHi Harry:
The WRA amplifier has an outdoor-rated chassis of IP:64, and an external Power Supply rated at Ip:67. There is no problem running a system outdoors while being placed undercover (with some protection from the direct elements). You can connect an ALEXA device, especially if you have a Line output (3.5mm stereo connection), or check with your device to see if it can be a Bluetooth Transmitter. You could then connect via Bluetooth from the Alexa device with the WRA set to Bluetooth.
TimL/6-10-21\r