Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Mackie SRM450 122-way Compact SR Loudspeaker
Product description: Mackie SRM450 122-way Compact SR Loudspeaker
Product feature: 2-way bi-amplified, optimized Active loudspeaker system, High-output precision titanium compression driver, Neodymium long-throw low frequency transducer with 3-inch voice coil Servo Feedback
Product price: $104.99
Product brand: Mackie
Target attributes: Use
Answer: attribute: use
value: None
source: None