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: BARSKA Starwatcher 400x70mm Refractor Telescope w/ Tabletop Tripod & Carry Case
Product description: Glass-coated optics for enhanced image brightness Includes Beginner's version of Deepsky Astronomy Software Soft carrying case allows you to bring the Starwatcher anywhere A Telescope For Any Skill Level, The Barska 40070 Starwatcher Compact Refractor Telescope with Table Top Tripod and Carrying Case is an ideal telescope for the aspiring amateur astronomer. Ideal for students or those interested in learning more about the night sky, the 70mm objective lens can zoom up to 300x power. Use one of the interchangeable eyepieces with a 3x power Barlow lens for increased viewing capability., Included with the telescope is a sturdy adjustable tripod, excellent for astronomy enthusiasts and professionals. Also included is a soft carrying case, allowing you to take this portable telescope outdoors at night to watch the stars open up before your eyes., Barska's beginner's version of the highly popular Deepsky Astronomy Software is also included with purchase. Deepsky is packed with features that will satisfy both novice and experienced users. The software includes a searchable database of over 10,000+ nebulae, star clusters, double stars, variable stars, and other celestial wonders. Simply download it to your PC and begin your journey to the stars., Barska is committed to customer satisfaction and provides free technical support. Review the User Manual for more information.
Product feature: Entry-level telescope with 300x power and 400mm focal length, Coated glass optics for enhanced image brightness, Interchangeable eyepieces with 3x Barlow lenses for versatility, Includes beginner's version of Deepsky Astronomy software, Adjustable tripod and soft carrying case; limited lifetime warranty
Product brand: BARSKA
Target attributes: Aperture
Answer: attribute: aperture
value: 400x70mm
source: product title