Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Alienware 17 ALW17-5314sLV 17-Inch Laptop (Silver-Anodized Aluminum) [Discontinued By Manufacturer]
Product description: Packed with power. Made to move. This 17" laptop combines powerful performance and incredible graphics into a revolutionary new design- perfect for immersive gaming.
Product feature: 4th Gen Intel Core i7-4710MQ processor, 8 GB DDR3, 1TB 5400 rpm Hard Drive, 17-Inch Screen, Windows 8.1
Product brand: Alienware
Target attributes: Battery Life
Answer: attribute: battery life
value: None
source: None