Dell Latitude 7400 2-in-1 Setup and specifications guide

ExpressSign-in

On Dell Latitude systems, the proximity sensor is accessed when the system is ON or in the sleep mode. The valid state of the proximity sensor is Near, and Enable with external monitor. The proximity feature is automatically disabled while the laptop is in the On state, and the remaining battery of the laptop is less than 30 minutes.

ExpressSign-in behavior in Near state

The following table explains the Near state behavior:

NOTE:The Dell ExpressSign-in user interface is the proximity sensor feature in Dell Latitude 7400 2-in-1 laptop.

NOTE:In the ExpressSign-in window, click Go next to the Setup facial recognition field to start and setup the Windows Hello facial sign-in option.

Table 1. Near state behaviorNear state behavior
System state	Description
ON/Standby	Wakes up the system when the user is within the sensor Field of View (FoV) of the system during the ON state and the LED illuminates solid white light or in the standby state. NOTE:Sensor does not wake the system from the low power states which is battery life less than 30 minutes. NOTE:Sensor does not support wake the system from hibernation and power off state.
Off	Does not wake the system from any of the power states even when the user is within the sensor Field of View (FoV).

ExpressSign-in with the external monitor usage state

You can select ExpressSign-in enabled while connected to external monitor(s) to Yes to keep the ExpressSign-in function still working even when the external monitor is connected. Select No to temporarily disable the ExpressSign-in functionality with the external monitor connected. The following table explains the External monitor usage state behavior:

Table 2. External monitor usage state behaviorExternal monitor usage state behavior
System state	Description
Yes	If the system is connected to an external monitor, the proximity sensor checks whether the user is within the sensor FoV.
No	This is the default state and the system state remains unchanged even when the user is outside of sensor FoV.

When one or more external monitor(s) are connected to the system and Near or Away state is enabled, the Dell ExpressSign-inwindow is displayed on the primary monitor, and you can select Yes or No to enable or disable the proximity sensor.

If you select Yes, the proximity sensor is enabled. If you select No, the proximity sensor is not enabled. if you select the Do not show again checkbox, a message that the user must be within the sensor FoV for the features to function properly is not displayed until the option is again enabled manually.

NOTE:If multiple monitors are connected, the Dell ExpressSign-in window is displayed only for the first external monitor that is connected to the system and not for the subsequent monitors.

Launch Dell ExpressSign-in/Systray icon

The Dell ExpressSign-in application supports the auto-run feature only when the application stays in the system tray. Once you exit the Dell Proximity Sensor application, you have to re-launch the application and enable the feature manually. You can enable the Systray icon to start the Dell ExpressSign-in window from the system desktop after Dell Proximity Sensor has been launched.

To start the Dell ExpressSign-in , do the following:

Click Windows Settings > System > Power & Sleep > Dell Proximity Sensor > Change PC behavior based on your proximity to the PC to start the Dell ExpressSign-in window.
NOTE:You can start the Dell Proximity Sensor window when the system is ON or in the sleep mode.
Click Change PC Behavior based on your proximity to the PC that is displayed at the bottom of the Settings screen.
You can also double-click Systray to start the Dell ExpressSign-in window.

Right-click Systray to view the context menu.

The options in the context menu are:

Table 3. Context menu optionsContext menu options
System state	Options
Near and Away	Select Away to enable the system lock and turn off the display when you move away from the system. Deselect Near to disable the system lock when you move away from the system.
Enable with external monitor(s)	Select Enable with external monitor(s) to enable the ExpressSign-in. Deselect Enable with external monitor(s) to disable the ExpressSign-in.
Open application	Select to start the ExpressSign-in desktop application.
Quit	Closes the ExpressSign-in desktop application and deletes the Systray icon from the system. Restart the ExpressSign-in from the operating system settings page or use the Search option to view and start the ExpressSign-in.

Dell ExpressSign-in Field of View (FoV) states

The Field of View (FoV) defines the distance and the angle that the proximity sensor can detect while the proximity feature is enabled. The FoV includes range angle and range distance. Dell recommends the distance between you and the laptop display should be 70cm for optimum performance of the proximity sensor.

Table 4. FoV statesFov states
Field name	Description
Range angle	The proximity sensor should function satisfactorily in detecting user presence / absence within a27° conical range as defined by the center of the target.
Range distance	The proximity sensor should function satisfactorily in detecting user presence / absence <100cm away

Lock timer

The lock timer is the approximate time for Dell Express Sign-in to identify that the user is no longer in front of the system or within the FoV. This feature will recognize your physical absence and lock the system.

The lock timer values are 60 seconds (default), 90 seconds, and 120 seconds. If Away is set to OFF, the Lock timer option is grayed out.

Supported hinge angles

The ExpressSign-in works as configured in a supported four hinge angles for a particular mode. The ExpressSign-in does not change the existing state if you are within the sensor FoV for an unsupported hinge angle. Once the system is in the supported hinge angle, the ExpressSign-in will start to change the state. The supported hinge angles are: