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: Panasonic VIERA TC-L42U5 42-Inch 1080p 60Hz Full HD LCD TV (2012 Model)
Product description: The TC-L42U5 (42-inch class) is one of two LCD HDTVs (cold cathode backlighting) in the 2012 collection. This TV is a 1080p model with three HDMI terminals, one USB port, a PC input, and features Game Mode.
Product feature: Full HD LCD, Refresh rate: 60Hz, 3 HDMI 1 USB 1 PC Input, VESA compatible Tabletop included, TV without stand (Width x Height x Depth): 39.4-Inch x 24.7-Inch x 4-Inch, TV with stand (Width x Height x Depth): 40.7-Inch x 26.7-Inch x 10.7-Inch
Product brand: Panasonic
Target attributes: Width
Answer: attribute: width
value: None
source: None