When smartphone is left near the entrance area, third party can press the touch button to enter the house. Security Area Control is a function to prevent that scenario from happening. 
When a smartphone is in Authorization Area, this function will automatically reduce the range of Authorization Area by 3 minutes interval for 2 times. 
If the smartphone is still inside Authorization Area, a notification will appear in the application. 

【How Authorization Area will be reduced】
①If a smartphone is inside Authorization Area for 3 minutes ⇒ Authorization Area first reduction
②If a smartphone is still inside the area for 3 more minutes (6 minutes in total) ⇒ 1 more reduction
③If a smartphone is still inside the area for 3 more minutes (9 minutes in total) ⇒ Notification

【How to revert back】
The range of Authorization Area can be reverted back by methods below. 
・Operating on the door by using the smartphone currently inside Authorization Area
・Cutting the connection between door (digital lock) and smartphone

＜Example＞
・Moving the smartphone out of Transmission Area
・Restarting the smartphone (including restarting the application)
・Disabling smartphone's Bluetooth function