Plantronics Savi W745UNLIMITED Talk TimeSAVI 3 IN 1 ConvertibleUCDECT 6.0NA. The Savi 700 Series gives the word productivity a whole new meaning. This new wireless system lets you move around the office without missing a call from your desk phone mobile phone or PC. With multi-device connectivity a newly designed lightweight headset and up to 350 feet of wireless range.