Apple will have a lot to say about its business when it releases the results of its June quarter earnings Tuesday after market close. And a lot of attention will be focused on its iPhone, with analysts predicting unit shipments of 50 million.

When all is said and done, there’s one thing Apple won’t reveal -- how many Apple Watches it has sold since its April launch. It's something that Tim Cook has been hesitant to share since October. Analysts have made their best guesses in the meantime, with estimates ranging from 2.85 million to 5.7 million units. Here’s a video explaining why Apple isn’t expected to share details on the Watch.