Clip-on open earbuds
Sony's ear-cuff earbuds clip onto the outer ear and leave the ear canal open, so surrounding sound stays audible. Reviewers found them comfortable but the bass light and the features basic.
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Ear-cuff fit
Each earbud clips onto the middle of the outer ear, and removable fitting cushions help it grip. Reviewers found them light enough to forget, though fit varies by ear and some needed the cushions to stop slipping or pinching.
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Voice Boost and leakage reduction
Voice Boost raises the volume and brings voices forward in noisy places, and Sound Leakage Reduction cuts what people nearby hear in quiet ones. Reviewers found the leakage mode works by trimming treble, and the EQ applies only in Standard mode.
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Light bass
With nothing sealing the ear, reviewers found the bass weak, though they praised the clarity and sense of space.