So, you know how there's a clock that tells you the time? Well, a speaking clock is just like that, but instead of just showing you the time, it talks to you and tells you what time it is!
This is really helpful for people who maybe can't see the clock or don't know how to read numbers yet. All they have to do is dial a phone number and the speaking clock will tell them the time.
It's kind of like having a robot friend who just tells you what time it is whenever you ask! And because it's a robot, it never gets tired or bored of telling you the time – it's always there to help you out.