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_name_69 ( kb_s VARCHAR, avg_transfer_rate_ INTEGER, device VARCHAR )

### Question ###
What is the smallest transfer rate for a 3243 device?

### Accurate SQL ###

SELECT MIN(avg_transfer_rate_) AS "kb_s" FROM table_name_69 WHERE device = 3243