This is a single relay smart switch that comes Pre-flashed with ESPhome. That means it works out of the box with Home Assistant. Power it up, connect it to your wifi network, and Home Assistant will detect it and integrate it automatically.
The company that makes these claims they can support 16 amps. I would not recommend putting loads that large on them. Probably something like 10 amps would be a safer limit.
The screw terminals are quite secure. The device is small enough to fit in a switch box behind traditional light switches, and it can work with 3-way switch configurations (Power from the breaker and wires to the Lights must come from the same switchbox for this to work).