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The main difference between the SoundLiberty 88 and SoundLiberty 92 earbuds is that the SoundLiberty 88 has improved microphone technology for phone calls. The SoundLiberty 88 has noise cancellation for the microphones (not the headphones) to help remove background noise while you’re talking on the phone.
The battery case for the SoundLiberty 92 can hold one additional charge (total of up to 30 hours of playback time) over the SoundLiberty 88 (total of up to 25 hours of playback time).
See the full comparison below: