Yeah, same! I thought I had a pretty good guess from the context, but “cold camera shoe” is a new term for me. Glad Lemmy has such a great community though, there are some awesome responses in this thread!

Not sure if this is what you’re describing, but phones like the one you pictured have a reversible tab for use if you mount the phone to a wall - if the tab is sticking up, it keeps the receiver from falling off the cradle.

Here’s a site selling them, but it has a diagram showing where it’s located:

https://www.zcover.com/store/catalog/zCProduct.php?wp=WP_CI881CTR&zPath=212-213-255

I’ve run it on an iPhone 5 or 6, I don’t recall… had it watching my living room for a month while I was away, and aside from a few false positives when light patterns changed due to the wind blowing tree branches around, it was excellent.

That is weirdly specific and also 100% true - I’ve seen that album in almost every Goodwill where I’ve checked out the vinyl