Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Lenovo S41 14 Inch Laptop (Intel Core i7, 8 GB, 1TB HDD, Black)
Product description: The S series deliver amazing performance in a thin & light design. Now you can work harder, play faster, and do more with a laptop that is built for on-the-go customers.
Product brand: Lenovo
Target attributes: Weight
Answer: attribute: weight
value: None
source: None