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: Original English Version Hikvision Network IP Camera DS-2CD2632F-IS, 3MP 2.8-12mm Vari-focal Lens IR , with Audio/alarm,IP66
Product description: Hikvision mini IP Infrared camera ,V5.2.5 newest version CMOS 1080P(Full-HD) Outdoor Bullet Camera Model Number:DS-2CD2632F-I(S) Max. Image Resolution:2048 x 1536 Image Sensor:1/3" Progressive Scan CMOS NOTE:The product is 2.8-12mm vari-focal lens,you can adjust it according to your needs between 2.8-12mm,meeting your requirements perfectly.
Product feature: 3 megapixel high resolution 2.8-12mm vari-focal lens, 3D DNR & DWDR & BLC IP66 rating, IR range: up to 30m, Audio and alarm optional, True day / night
Product brand: Hikvision
Target attributes: Field of View
Answer: attribute: field of view
value: None
source: None