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

Input:
Product title: GLS AUDIO Bulk Microphone Cable 300' Blue Mic -300ft Signal mike cable
Product description: Professional Series Noise Free Mic Cable by GLS Audio. The cable has a thick, high quality, flexible rubber jacket (not that cheap stiff plastic jacket like others sell). It is heavy duty Noise Free "True Balanced LO-Z" cable with dual insulated copper conductors plus it has a spiral copper shield.
Product feature: Heavy Duty Flexible Rubber Jacket, True Balanced Lo-Z Shielded Cable, High Grade 21AWG 3 Copper Conductors (2 Hot & 1 Ground Shield), High Quality Noise Free Performance, Great for Studios, Pro Sound, & DJ's
Product price: $79.99
Product brand: GLS Audio
Target attributes: Audio Channels
Answer: attribute: audio channels
value: None
source: None