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: Pioneer HTP-071 5.1 Channel Home Theater System (Discontinued by Manufacturer)
Product description: component Based 5.1 surround sound system featuring a high powered AV receiver, 3d ready HDMI inputs, Audio return channel, 5 satellite speakers, and ported down firing subwoofer.
Product feature: 5.1 Channel, Amplification Type: Direct Energy, 600 Watts Maximum Power Output
Product brand: Pioneer
Target attributes: Configuration
Answer: attribute: configuration
value: 5.1 channel
source: product title
attribute: configuration
value: 5.1 channel
source: product feature
attribute: configuration
value: 5.1
source: product description