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

Input:
Product title: Acer 11.6" Aspire One Netbook 2GB 250GB | AO722-BZ897
Product description: Screen Size: 11.6 Screen Resolution: 1366 x 768 Processor Type: AMD Processor Model: C-50 Processor Speed: 1GHz
Product feature: Hard Drive:320GB, SATA, DDR3, Memory: 2GB DDR, Processor: Dual-core, 1GHz, C-50, Operating System: Windows 7 Home Premium 64-bit, Display Screen Technology: CineCrystal
Product brand: Acer
Target attributes: Weight
Answer: attribute: weight
value: None
source: None