It is a 4 or 8 channel relay unit. With the wifi feature, it is managed from IOS and ANDROID based products over the internet in your home. Scenario support such as I'm at home, I'm out, Child, Vacation mode is provided. Management is provided either from the Key, from the intercom panel in the flat or from the mobile phone. Additional modules can be added as needed. The relay unit can be used both as a curtain module and as a relay module. How each channel of the device works  determines.