There are a few differences. Buds have 30 hours, Z has 20 hours. Buds give you 10 hours in 10 minutes charge and Z gives you 3 hours in 10 minutes charge. Buds have 13.4mm dynamic driver, Z has 10mm dynamic driver. Buds have 3D stereo with Dolby Atmos and Dirac Audio Tuner support while Z has Bass Boost.
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