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: USB Hub 2.0 4-port for Mac and Pc High Speed. Very Cute Octopus Design.
Product description: USB Hub 2.0 4-port For Mac and PC High Speed. Very Cute Octopus Design.
Product feature: Very Cute Design., Total of 5 wires. 1 Input, 4 Outputs. Connects up to 4 USB., USB 2.0 for faster transfer speeds., Compatability with Windows 7, XP and Mac, True Plug & Play. No Software Required
Product brand: Tiesto
Target attributes: Number of Ports
Answer: attribute: number of ports
value: 4-port
source: product title
attribute: number of ports
value: 4-port
source: product description