Check the listing for details. Poly Savi 7220 Stereo DECT 1920-1930 MHz Top. Color: Black, Condition: New. Listed at 150.03 USD. Help office workers be more productive ? it?s easier than you think. The Savi 7200 office series of DECT wireless headsets for desk phones are crowd pleasers that let workers roam far. Compatible with 800+ desk phones, they?re cost effective, too. Everyone in the office could use more flexibility. They can roam confidently 400 ft /120 m from the headset base with up to 12 hours of talk time. And collaboration is simple, since teams can conference up to four headsets on a single base. Savi 7200 wireless headsets offer instant integration with over 800 analog and IP desk phones from industry leading makers ? including a wide range of phones that Poly offers. Optimize range, save power, and maximize office space with the DECT adaptive power system. It automatically adjusts wireless signal.