Harvi is a clever little device that allows the zappi and eddi to be installed without a wired ct clamp. The harvi is an energy-harvesting wireless sensor – an essential part of the installation process that saves time and money. it eliminates unsightly wiring, prevents disruption to your home decor, and enables the myenergi product family to be installed without using a hardwired current transformer. no power source is needed for harvi – the energy from the ct is harvested and used to transmit the measurement signal to the zappi or eddi. harvi is fully compliant with worldwide power grid standards and comes with a 3-year warranty.