Durable stainless steel flush mount handsfree speakerphone with push button for ring-down operation and red/green LED light provides visual indication of call progress.Telephone can be programmed to time out calls from 1-9 minutes or no time out and block or allow incoming calls. Telephone can not be left off-hook, as it detects when called party hangs up and resets itself. Phone relies on external equipment to control calling. Equipped with red push button, Braille EMER PHONE (emergency phone) plate, weatherproof, puncture resistant speaker and microphone. Telephone can be flush mounted or installed in our 331-005 weatherproof or 331-HOB weather resistant housing.