Additional equipment includes a swappable 6,100 mAh battery (8") or 7,600-mAh battery (10"), a push-to-talk function and powerful wireless communication. If this is not enough, then optionally expand the tablets with the tools of Zebra Mobility DNA or convert it into a fully-fledged PBX handset via Zebra Workforce Connect Voice. Naturally, the ET40 and ET45 are tough: According to IP65 and MIL-STD-810H they are resistant against dust, water and falls. Plus, they are suited for both office employees and field service.