The Meehoo with an Exactlywatt

Knock knock! Who's there? Me! Me who? That's right! What's right? Meehoo! That's what I want to know! What's what you want to know? Me, who? Yes, exactly! Exactly what? Yes, I have an Exactlywatt on a chain! Exactly what on a chain? Yes! Yes what? No, Exactlywatt! That's what I want to know! I told you - Exactlywatt! Exactly what? Yes! Yes what? Yes, it's with me! What's with you? Exactlywatt - that's what's with me. Me who? Yes! Go away! Knock knock...