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: Velodyne 170-Watt 12" Subwoofer (CT-120) (Discontinued by Manufacturer)
Product description: Hearing bass is vital when listening to music or your favorite movie so pick up this Velodyne 12-inch subwoofer for 170-watts of deep bass power amplification. There are line level outputs as well as inputs for both low & high level connections!
Product feature: 12-inch home audio subwoofer, 25Hz - 120Hz frequency response, 400-watt power handling, 170-watt amplifier power, Shielded for video use
Product brand: Velodyne
Target attributes: Use
Answer: attribute: use
value: None
source: None