A Certified Refurbished product is one thats been returned to Bose, for any reason. Its then thoroughly inspected, tested, and serviced to meet strict Bose sound quality standards - the same as a new product. Appearance is closely examined; products occasionally have minor, nearly imperceptible blemishes. All Refurbished products have the same warranty as new products, and are available only from Bose. Quantities are limited. - Microphones: Built-in Microphone. Sound Options: Shielded Speakers, Speakerphone, SimpleSync, Party Mode (When Enabling Two Speakers), Stereo Mode (When Enabling Two Speakers). Noise Control Type: Echo Reduction. Audio cable included: No. Water Resistant: - SoundLink Micro Bluetooth speaker - Micro-B USB charging cable