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: Heath Zenith VSRA-A Wired Push Button, Antique Brass Finish with Black Center Button
Product description: Heath Zenith VSRA Basic Collection, Wired Push Button, Antique BrassHeath Zenith is synonymous with quality, integrity and innovation around the globe. They are committed to developing products that enhance their customer's lives through peace of mind, safety and convenience. Heath Zenith has been the leader in innovative and quality products for over 60 years.Heath Zenith VSRA Basic Collection, Wired Push Button, Antique Brass Features: Antique Brass Finish with Black Center Unlighted Surface Mount 2.25" Round, .875"d 1 Year Warranty, The VSRA-A wired push button features an antique brass finish with a black, unlighted center. This push button is mounted to the surface of your doorframe or exterior wall. It requires no additional holes to be drilled, and sits flush on the surface it is mounted to.
Product feature: Low Voltage Hardwired Push Button, Antique Brass Finish with Black Center Button, Unlighted - Surface Mount, Works with any Heath/Zenith Low Voltage Chime System
Product brand: Heath/Zenith
Target attributes: Operating Range
Answer: attribute: operating range
value: None
source: None