Delivery and settlement as always reliable and fast.
operate three of these thermostats in my house to the main rooms to control.
About the CCU1 these are directly connected to each one / two window contacts. If a window is open, the thermostat switches down.
Works reliably, integration into the system "HomeMatic like" sufficient quality (comparable Honeywell thermostat)
Easy programming of heating periods, for different days and different heating times.
Am quite satisfied and the parts would buy again.