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: Acer Aspire V5-131-2629 11.6" Laptop (Black)
Product description: Shop the Windows Store for the full selection of Windows 8 PCs
Product feature: Windows 7 Home Premium - 64-bit version, 1.5GHz Intel Celeron 1007U processor, 4GB DDR3 memory, 500GB hard drive, 11.6-Inch LCD display (1366 x 768), Intel HD Graphics, Intel NM70 Express chipset, Webcam, Wi-Fi, 10/100 LAN, Bluetooth, HDMI, USB, card reader, 6.5-hour battery, 1-year limited warranty
Product brand: Acer
Target attributes: Screen Size
Answer: attribute: screen size
value: 11.6-inch
source: product feature
attribute: screen size
value: 11.6"
source: product title