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: Adrienne Vittadini Footwear Women's Chavi Wedge Sandal
Product description: Timeless elegance, pure luxury and legendary glamour embody the look and feel of each handbag, clutch and hobo created by designer Adrienne Vittadini. Featuring vibrant colors and prints, each piece projects a "Euro-American" point of view, combining vintage looks and tailoring with a spirited, contemporary design.
Product feature: 100% Metallic Leather, Imported, Rubber sole, Heel measures approximately 4", Platform measures approximately 1.0", Package Dimensions: 10.5 x 9.6 x 4.4 inches, Shipping Weight: 1.8 pounds, ASIN: B00SHK4JVG, Item model number: Chavi, Date first listed on Amazon: May 6, 2015, Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 4.0 out of 5 stars 5 customer reviews
Product brand: ADRIENNE VITTADINI
Target attributes: Heel Style
Answer: attribute: heel style
value: wedge
source: product title