How do Trinitarian Christians understand the description of Deity in Isaiah 46:9?

How do Trinitarian Christians understand the description of Deity in Isaiah 46:9? Who is speaking in this verse? > Remember the former things of old: for I am God, and there is none else; I am God, and there is none like me (Isaiah 46:9 KJV) Since this is a question about theology, not translation philosophy, for reference I've added below the text of this verse with transliterations of the Hebrew words for God employed here: > Remember the former things of old: for I am God (El), and there is none else; I am God (Elohim), and there is none like me *** *** Related: How do non-Trinitarian Christians understand the description of Deity in Isaiah 46:9?