The transformer connects to your smartphone or tablet using Bluetooth Low Energy.
The SMART HUB-150 uses around 3 W when in idle status (lighting is switched off). Sample calculation: If the lighting is switched on for three hours a day, the transformer will be in idle status for 21 hours a day. This corresponds to 23 kW per year. With an energy price of €0.25/kWh, the total annual energy cost will be €5.75.