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: Fisher-Price Thomas & Friends TrackMaster, Porter - Motorized Engine
Product description: Introducing Porter - a welcome addition to the world of Thomas & Friends and the TrackMaster motorized railway from Fisher-Price! Porter is a tank engine with three domes on his boiler: one steam dome and two sandboxes. He is a very hard worker, especially down at Brendam Docks where he works alongside Salty. This motorized Porter engine is the perfect addition to your expandable, collectable TrackMaster world.
Product feature: Create new adventures with Porter the tank engine, Motorized Porter engine, Includes two cargo cars, Perfect addition to your expandable, connectable, motorized Thomas & Friends TrackMaster world, Motorized train track play is compatible with all TrackMaster track sets (sold separately)
Product price: $98.95
Product brand: Thomas & Friends
Target attributes: Battery Type
Answer: attribute: battery type
value: None
source: None