Fibaro Z-Wave Dimmer insert module retrofits into an existing light switch enabling you to wirelessly control lights. The new Dimmer 2 is a true universal dimmer - automatically selects the most suitable dimming type (trailing-edge or leading-edge) based on the bulb type used. It measures the power being used and reports that to the Z-Wave system and it is fully Z-Wave Plus certified - offering increased range, extended battery life and Over The Air upgrading (OTA)