Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: 19303117 GM Powered Subwoofer and Amp by Kicker
Product description: Kicker 200 / 400 Watt Powered Subwoofer Kit
Product feature: 14-16 Silverado Sierra Crew Cab Kicker 200 400 Watt Powered Subwoofer Kit OEM, Kicker 200 / 400 Watt Powered Subwoofer Kit, 19303117, GM
Product price: $118.79
Product brand: General Motors
Target attributes: Impedance
Answer: attribute: impedance
value: None
source: None