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_13727 ( "Protocol" text, "Power Line" text, "Radio-Frequency" text, "Open Source?" text, "Needs Neutral Wire?" text )

### Question ###
What's the open source of X10 that no neutral wire needed?

### Accurate SQL ###

SELECT "Open Source?" FROM table_13727 WHERE "Needs Neutral Wire?" = 'no' AND "Protocol" = 'x10'