Sound for wherever life takes you. The SoundLink Flex Bluetooth speaker is the perfect sidekick, with a waterproof, dustproof, lifeproof design that can handle whatever comes your way - with clear sound and deep bass. So whether you're hiking in the mountains, hanging by the beach, or just having friends over for dinner, the powerful Soundlink Flex helps you elevate the moment. - Microphones: Built-in Microphone. Sound Options: Shielded Speakers, Speakerphone, SimpleSync, Full Range Speakers, Party Mode (When Enabling Two Speakers), PositionIQ, Stereo Mode (When Enabling Two Speakers). Noise Control Type: Echo Reduction. Audio cab - SoundLink Flex speaker - USB-C to USB-A charging cable - Quick start guide - Safety sheet