What Am I Riddles

Question: What beats but inflicts no pain?

Question: What white coat lights up and is hot to the touch?

Question: I cannot speak but i tell everything.Im not a tree but i have a leaves. I have hinges but neither not a door nor a window. Who am i?

Question: Something longer than a camel but shorter ever than a Cup?

Question: I'm just a lot of nothing but I'm every were... what am I?