What do I need to use a Ring Mailbox Sensor

I would like to add a [Ring Mailbox Sensor](https://www.amazon.com/Ring-Mailbox-Sensor-Black/dp/B08FBK3YVX/). It's not at all clear from the Amazon listing what I need to use one. I have a Ring Alarm (2nd gen) base station and an Echo Show 5 (2nd gen, 2021 release). I use the Ring app on my Android phone. What else do I need to be able to get alerts on the Ring app? Ring Bridge? Can it be used to trigger my Ring Spotlight Camera? Thanks.