Wall-Mounted, White T108 Trimline Corded Telephone With Sos Key For Use In Wall Mountable Telephone | It is designed to use everywhere, especially in the hotel. Perfectly compatible with the wall mounted plate. Red 911 button | This dedicated quick dial button is easy to use in emergency and compatible with the hotel phone system. ON/OFF Ringer Switch | User can turn off the ringer to avoid disturb in their bedroom or in the hotel. MUTE button | you can still hear the other party while muting your side of the conversation. Indicating light | It comes with an indicating light on the right top corner which helps people to notice the incoming calls even when the ringer is off. Redial | A redial feature lets to quickly call the last outgoing number. No external power required | Working directly with a current telephone line.