VeriLock— https://www.andersenwindows.com/connect/ — is advanced technology called VeriLock that can wirelessly tell if your windows and patio doors are open or closed -- they even tell you if they are locked or unlocked. No other sensor can do that.
VeriLock

• The only sensors built directly into the windows and patio doors making them completely invisible.
• Available with professional and/or self-monitoring options
• Can be ordered with Andersen 400 Series, A-Series and E-Series products and 200 Series gliding patio doors
• Can be added to any of the above products already in your home
• Variety of color options to help sensors blend in with your windows, patio doors and home décor
• These sensors tell you if a window or patio door is open and locked or unlocked.

Now you can monitor your windows when you’re away from home like you can monitor your thermostat or lighting -- in real time.  Air escapes through unlocked windows and doors. VeriLock sensors tell you which windows and doors are open or unlocked so you can manage your units for maximum energy efficiency.