Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: HP EliteBook 840 G1 14-inch Ultrabook (1.90GHz, Intel Core i5 4300U, 8GB Memory 120GB SSD Windows 7 Professional 64-bi
Product description: Refurbished Laptop
Product feature: Intel Processor
Product price: $209.00
Product brand: HP
Target attributes: Refresh Rate
Answer: attribute: refresh rate
value: None
source: None