The Polycom CX300 R2 phone is optimized for Skype for Business. Plug & play with the USB (Universal Serial Bus) port on an available PC or computer. Communicate through the handset, speakerphone or headset port. This USB (Universal Serial Bus) phone is designed to resemble a traditional desktop telephony device. Wideband audio lends the Polycom CX300 R2 phone reduced echo & feedback, creating more natural voice conversations. Keys on the phone's interface include redial, flash, delete, mute, speaker, handset & volume. LED indicators & a backlit display provide easy visibility of the status of the phone's functions.