Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_65222 ( "Model number" text, "sSpec number" text, "Cores" text, "Frequency" text, "Turbo" text, "L2 cache" text, "L3 cache" text, "GPU model" text, "GPU frequency" text, "Socket" text, "I/O bus" text, "Release date" text, "Part number(s)" text, "Release price ( USD )" text )

### Question ###
What's the sSpec number of the processor having an ultra-low power I/O?

### Accurate SQL ###

SELECT "sSpec number" FROM table_65222 WHERE "I/O bus" = 'ultra-low power'