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: Kicker Single 10-Inch Comp 4 Ohm 150W Loaded Subwoofer Enclosure Box | 43TC104
Product description: Kicker's TC10 adds a 4 ohm, 10" Kicker Comp subwoofer to your truck or coupe in no time flat!
Product feature: Thin design delivers both convenience and raw power
Product price: $10.12
Product brand: Kicker
Target attributes: Impedance
Answer: attribute: impedance
value: 4 ohm
source: product title
attribute: impedance
value: 4 ohm
source: product description