Circle of Awareness

You create a 15 foot radius sphere around yourself. You can detect every movement in that sphere. You automatically succeed on Perception checks to detect things inside the sphere, including things magically hidden. You are not affected by unseen enemies and can't be surprised. You also have advantage on Investigation checks to do with things inside the sphere. 

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher the radius increases by 5 feet for each spell slot above 1st.