Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_21 (voltage VARCHAR, model_number VARCHAR)
### Question:
What is the Voltage for Model Number c3 866?
### Answer:
SELECT voltage FROM table_name_21 WHERE model_number = "c3 866"