Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: LG IMPRINT LG-MN240, Slider Phone
Product description: You've been looking for your perfect phone; sleek, sensible, easy-to-use.all that you could possibly need and nothing more. That's the LG Imprint; contained within its unassuming pocket-sized exterior, it has what is required to get you through your day. Its robust contact lists allows you to access friends, family, or coworkers easily. Whether you are snapping pictures or browsing the web, backing up contacts or paying bills, the LG Imprint will impress you.
Product feature: Vertical slider with full QWERTY keyboard, 1.3MP camera, MP3 music player with expandable memory support, Stereo Bluetooth connectivity, View LG Imprint User Guide
Product brand: LG
Target attributes: Lens Quantity
Answer: attribute: lens quantity
value: None
source: None