Cisco CP-7906G 7900 Series IP Phone Dynamically presents calling options to the user; the scroll toggle bar allows easy movement through the displayed information A volume-control toggle provides easy decibel-level adjustments of the handset, speaker, and ringer Offers more than 24 user-adjustable ring tones Lights when pressed to put a call on hold and stays lit until the held call has been resumed, or flashes if one call is held while another is engaged; is dark when no calls are on hold POE (Powered Over Ethernet); optional power adapters sold separately. Requires Cisco UCM License (Sold Separately).