It means the STB will now send reminders to you when your recharge due date nears. The feature will get activated when you are 5 days away from recharge date. A pop up will appear on the screen telling you the Sub ID, Next rech date, Rech Amount. You can even check next recharge date, Daily Burn rate(DBR), last amount recharged, last recharge date, etc.
This feature is currently new and will be enabled soon.