Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Dragonwar Phantom Wired USB Laser Professional Gaming mouse with 5600 DPI
Product description: Assign Your Choice of Key Gaming Actions to Programmable Buttons to Create Your Own Custom Profiles. Package content: Mouse, manual, dragonwar sticker, spare foots (4), CD driver.
Product feature: Ergonomic design for professional gamer and powered by 5600 DPI precision laser engine, 10 control buttons and adjusted Sensor Resolution of 800/1600/3200/5600 DPI, Tuning weight-in design offer the perfect feel you want in your hand, Adjustable Length to Suit Your Hand Size and Grip Style and Precision Aim Mode that Will Hit Your Target the First Time, Cable length 2 m (79 inches) and compatible with Win & Mac OS
Product price: <div class="a-section a-spacing-none"
Product brand: by Dragonwar
Target attributes: Number of Buttons
Answer: attribute: number of buttons
value: None
source: None