What makes a good/effective speech?

In my opinion, there are several factors that make a good and effective speech. One of the most important factors is the tone of the person speaking, it helps to set the mood that the person is trying to set, and lets the audience knows what to feel. Another important factor is how well the speech is written, the person speaking needs something good to work with, otherwise what they say will make no sense and will not inform the audience of the message that is trying to be told. One final factor that  I feel is important is how long the speech is. Whether the speech is short or long, as long as the message gets across without any unnecessary details, there is no limit to how long or short the speech can be.