The Polycom EM50 Expansion Module is easy to install and designed exclusively for the Polycom VVX 450 business IP phone. It's an optimal solution for telephone attendants, receptionists, administrative staff and other power users who manage multiple workflows or simultaneous calls on a daily basis. The Polycom EM50 Expansion Module extends the functionality of your Polycom VVX 450 business IP phone with multifunctional line keys that can be set up as line registrations, call appearances, speed dials, direct stations and/or busy lamp field keys. The VVX EM50 Expansion Module seamlessly matches the look and feel of your VVX 450 business IP phone. When fully equipped, the VVX 450 business IP phone functions as a high-performance attendant console that can support up to two VVX EM50s. Telephone attendants can reduce the number of lost customer calls, shorten transaction times and increase the accuracy of call routing by promptly accepting, accurately screening, efficiently dispatching and effortlessly monitoring calls. The VVX EM50 securely delivers a rich-media experience across any workspace and with the best possible quality. It's an easy plug-and-play device that requires no setup, as power and signaling are provided by the host VVX 450 business IP phone.