Allen Tel Mini-Elevator/Hall Speaker Phone with 2 Min Automatic Disconnect for ARD Circuits Allen Tel mini-elevator/hall speaker phone with 2 min automatic disconnect for ARD circuits is more latest and advanced speaker phone made by Allen Tel to satisfied the need for communications in lifts and halls and parking ramps, campuses, door entry and other high-risk places. This mini-elevator/hall speaker phone is directly connected with phone line and line connects when you push the button over the phone. There is two minutes timeout feature is also available with this speaker phone which automatically disconnects the calls after two minutes. This phone is powered by telephone line with no batteries or AC power required. Features: The range joins when the pushbutton is pressed 2-minute "Timeout" function which disconnects the contact after two minutes LED is offered to indicate an "Off Hook" condition