What Band number has a Power (W) of 400 or less?
CREATE TABLE table_64771 (
    "Band" real,
    "Frequency (MHz)" text,
    "Wavelength" text,
    "Type" text,
    "Power (W)" real
)
SELECT SUM("Band") FROM table_64771 WHERE "Power (W)" < '400'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What Band number has a Power (W) of 400 or less? ### Input: CREATE TABLE table_64771 (
    "Band" real,
    "Frequency (MHz)" text,
    "Wavelength" text,
    "Type" text,
    "Power (W)" real
) ### Response: SELECT SUM("Band") FROM table_64771 WHERE "Power (W)" < '400'