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: NavePoint Articulating Corner Wall Mount TV Bracket Tilt Swivel 23-42 Inches with Component Shelf
Product description: This full motion articulating wall mount is perfect for mounting most any 23 to 42 inch LCD TV or Monitor to the wall. It has a 20 degree up and down tilt and 90 degree left and right swivel allowing you to position the screen perfectly for your application. Comes with a dual glass component shelf.
Product feature: Mounts most 23 - 37" TVs. Dual glass component shelf included., Load Capacity: 66 pounds, Tilt: -20 to +20 degrees, VESA: 75x75/100x100/200x100/200x200mm, Swivel: -90 to +90 degrees
Product brand: NavePoint
Target attributes: Maximum Screen Size
Answer: attribute: maximum screen size
value: 42 inch
source: product description
attribute: maximum screen size
value: 42 inches
source: product title