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: Canon LS390H Calculator
Product description: LS390H Pocket Calculator, Canon's compact, lightweight LS-390H is an ideal tool for home, office, and school, providing a range of functions for quick calculations and easy figuring of finances. An extra-large, eight-digit LCD display is easy to read, and the comfortable keyboard design and special function keys increase your speed and accuracy., The LS-390H provides all the basics of calculation: addition, subtraction, multiplication, division, constant multiplication, division and percentage calculations, percentage add-on, and discount calculations. It also has memory calculation, exponentiation, square roots, reciprocals, sign change, and various mixed calculations. Indication functions include overflow and error sign (E), memory sign (M), and minus sign (-)., The LS-390H features an automatic power selection that shifts between solar and battery power as needed.
Product feature: Basic calculator for travel or office, 8-digit display, Soft plastic keys, Solar powered, Easy to use
Product price: $8.03
Product brand: Canon
Target attributes: Type
Answer: attribute: type
value: pocket
source: product description