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: COBRA CB RADIO W/SWR 40CH
Product description: Cobra 29 LTD Classic CB Radio
Product feature: Product Type:CB Radio, Brand Name:Cobra, Manufacturer:Cobra Electronics Corporation, Product Model:29 LTD, Product Name:29 LTD Classic CB Radio
Product brand: Cobra
Target attributes: Service
Answer: attribute: service
value: cb radio
source: product feature
attribute: service
value: cb radio
source: product title
attribute: service
value: cb radio
source: product description