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: 2.1CH Home Speaker System for Pc
Product description: 2.1CH Home speaker system for PC
Product feature: Features -, Memory foam for extra padded protection, Soft, thin, plush interior to prevent scratches, Includes a handy multi-purpose pocket
Product brand: jWIN
Target attributes: Use
Answer: attribute: use
value: for pc
source: product title
attribute: use
value: for pc
source: product description