The Shelly Wave Pro Dimmer 2PM is a two-channel DIN-rail mounted dimmer, compatible with a wide range of halogen lights, dimmable LEDs and ferromagnetic transformers between 110-240V and designed to be mounted in the breaker box to offer centralised dimming control for two separate lighting circuits. The Wave Pro Dimmer 2PM is compatible with pre-existing light switches, whether single or dual-button, and can also be controlled remotely via the free Shelly mobile app. In addition to its dimming functionality, the SHELLY-WAVE-PRO-DIMMER-2PM also features power monitoring capabilities, with the ability to measure the energy usage of any connected lighting systems every 60 seconds to an accuracy of within 1%. These measurements can then be either stored locally for up to 30 days, or securely uploaded to the cloud for later analysis, and offer a unique birds-eye view over the power use of your lighting. ***Please note: This device operates exclusively over Z-Wave, and needs a Z-Wave hub to work (sold separately).