U3 Wi-Fi Smart Light Switch

Yes, it can be used by more than 1 phone. You will use one phone to create an iotty account and register the devices (the primary phone). Then you will use a second phone to register a different iotty account (the secondary phone). The primary phone has the ability to share with any number of secondary phones, simply:
Gear icon > Profile > Sharings > click on the “+” > insert the iotty account email > choose which switches to share.

The iotty Smart Switch does not currently support dimming. The switch was designed with an ultra clean and modern aesthetic in Italy where dimmers are not nearly as common as in the US.

This version of the iotty switch is not designed for use in 220/240v environments.

Yes, in order to monitor energy usage, you will need to enter the wattage useage of the load the light is controlling into the iotty app. You can also monitor the actual cost by entering the cost per kWh. This will allow you to access trends of usage through the app.

This product does not directly integrate with HomePod. The switch can control the power on/off and also can be used with voice assistants (Alexa, Google Home, Siri Shortcuts) but would not directly work with HomePod in any other capacity.

It will work with garage doors that support a pulse open command through the exposed terminals. In this case, you connect the iotty switch "L" terminal to the 110V power in the gang box and connect the LR# leads of the slot you want to control the door with the leads connected to the terminals.