What is meant by a By-me device?

They are the components that make up the Vimar home automation system for residential and commercial environments (actuators, controls, etc.). A device can in turn have their functional blocks work completely independently of each other (for example, a "rocker and push button switch unit" can be set for the left switch to control a By-me dimmer and the right-switch for a shutter actuator that may be in a completely different part of the house, and have its relay controlled by a thermostat.)