3 Programmable Ringer Tones Set your favorite tones when you are bored with the normal tones. An added feature that will liven up any work environment. Ringer volume can also be adjusted to low, medium or high. Mute Control Switch on to MUTE when you do not want the caller to hear your background discussions. Wall Mounted Save desk space by wall-mounting your phone. Most appropriate for tight spaces like the utility, pantry or copying room. Last Number Redial For speed dialing of last number recently used. Saves time on follow-up calls. Adjustable Ringer/Handset Volume Adjustable handset volume to high or low. Time Flash This feature supports Call Waiting and PBX functions. A safety measure to help ensure important calls or hold-lines are not accidentally cut off. Switchable Tone or Pulse Dialing This dual setting of Tone (push button) and Pulse (rotary) is an added function capable of working on tone or pulse type telephone lines.