Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: NEW Cobra 29 148 DX radio CB Radio S Rf power replacement meter
Product description: Workman C29 CB Radio Replacement Meter For Cobra 29LTD
Product feature: REPLACEMENT METER W/ LAMP, COBRA 29 RADIOS
Product brand: Cobra
Target attributes: Service
Answer: attribute: service
value: cb radio
source: product title
attribute: service
value: cb radio
source: product description