Considerably more microphone(s)
2 vs 1 —1 more microphone(s). More microphones result in better sound quality and enable the device to filter out background noise.
Substantially lower SAR for body (USA)
0.91 W/kg vs 1.08 W/kg—0.17 W/kg lower SAR for body (USA). SAR (Specific Absorption Rate) describes how much radio frequency energy emitted by the device will be absorbed by your body. The rate is measured at hip level. The legal limit is 1.6 W/kg in the USA.