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Plantronics Calisto 240-M is a USB handset that is designed to provide a plug-and-play solution for a familiar telephone interface for unified communications. Calisto 240-M features wideband audio, Plantronics SoundGuard technology, and an integrated full-duplex speakerphone. Connect the handset to a PC or Cisco DX series device using USB. Calisto 240-M is certified for Skype for Business and optimized for Microsoft Lync.