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: Refurbished - HP ELITE 8200 Small Form Factor Intel Core I7- 2600 3.4GHz , 8G DDR3 Memory , 1TB Hard Drive , DVDRW , Windows 7 Professional 64-bit, 1 Year Warranty
Product description: This Certified Refurbished product is a product that has been inspected, repaired, cleaned and re-packaged for sale after being used by a customer and returned. Although Skytech purchase and sell the highest Grade A off-lease products (unless otherwise marked for special sale), some items may show signs of use, such as minor scratches, ect. If saving money and resources is important to you and minor wear is acceptable to you, you should consider purchasing refurbished products.
Product feature: CPU:Intel Core I7- 2600 3.4GHz, 8G DDR3 RAM,1TB Hard Drive (7200 RPM),DVD-RW(read and write data on CD and DVD in multiple formats), Windows 7 Professional 64 Bit Pre-loaded, What's Included: 90 Days Antivirus, 30 Days Corel Office and Winzip Software Installed; Keyboard, Mouse, Power Cord, Warranty Card in package. // Connectivity: Please check the images, especially front and back images for the port types on the model. // **Wifi adapter is NOT guaranteed to come with model. **, Warranty: Limited 1 Year Warranty for Labor and Parts. // Skytech warranty is designed to provide peace of mind for customers. Under the terms of your Skytech warranty we will fulfill your requirements as best we can. Please always feel free to contact our Customer Support Team if you have any inquiries. We will get back to you ASAP to resolve your issue.
Product brand: AST Computer
Target attributes: Processor Brand
Answer: attribute: processor brand
value: intel core i7
source: product title
attribute: processor brand
value: intel core i7
source: product feature