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: Silverlit Mini Apache 3ch I/R Helicopter
Product description: Mini Apache 3ch I/R Helicopter. 3 channel remote control. 3 channel remote control with counter rotating blades. Dual fan-style blades flight time: 10-15 minutes off a 20 min charge.
Product feature: 3 channel remote control, 3 channel remote control, Counter rotating blades, Dual fan-style blades, Flight Time: 10-15 minutes off a 20 min charge
Product brand: SilverLit
Target attributes: Number of Channels
Answer: attribute: number of channels
value: 3 channel
source: product feature
attribute: number of channels
value: 3ch
source: product description
attribute: number of channels
value: 3ch
source: product title
attribute: number of channels
value: 3 channel
source: product description