Functions - Entering or changing a password. - In case that a door is closed when this switch is positioned at auto, a door is automatically locked. - One touch button for locking or opening at inside door. - A manual knob using at the time of forcibly opening and/or closing a door. - Enter password and/or register password. - Open a door by using it at the time of non operation by battery discharge and/or unknown reasons. - Replace betteries when it blinks red.