The number 991-06-50-01-CN appears to be a part or model code, possibly used in manufacturing, electronics, or industrial components.
991-06-50-01: Likely a product or serial identifier.
CN: May indicate "China" as the origin or manufacturing location.
For a precise description, more context (such as the industry or product type) would be needed. If this is a part number, consulting the manufacturer's documentation would be the best approach.