Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Nokia Lumia 720 Blue Unlocked Quad Band GSM Smartphone
Product description: Nokia Lumia 720 boasts a 4.3-inch IPS LCD Display which exhibits a display resolution of 800 x 480 pixels with a pixel density of 217 ppi. It runs on Windows 8 platform and gets powered with a 1GHz Dual-Core Krait Snapdragon S4 Plus processor coupled with 512MB of RAM and Adreno 305 GPU.
Product feature: Cellular Band - Quad-Band 850 / 900 / 1800 / 1900 Mhz, Cellular Band 3G - 850 / 900 / 1900 / 2100 Mhz
Product brand: Nokia
Target attributes: Weight
Answer: attribute: weight
value: None
source: None