Hi. I found a way to add a loud outdoor siren to the Ring Alarm and thought I would share it. First you’ll need the Ring Outdoor Smart Plug (and bridge). Once you install it, go to the base station and add this as a linked device. Then set it to “turn on lights” when the alarm is sounding.
You’ll then have a 120v power source that will turn on when the alarm sounds and then off when the alarm stops sounding (I’ve noticed a delay of about 15 seconds after the alarm is disarmed before it actually turns off). I then plugged a 12V DC Constant Voltage Transformer Driver to this in order to power a 12V DC siren as well as a LED strobe lights. However you can use it as you like.