This is the WI-FI module is for use with the HydroPro "Z" series inverter swimming pool heat pump range. This WI-FI interface allows you to control the swimming pool heat pump remotely via a tablet or smart phone once you download the applicable app, provided the heat pump is within range of a router or Wi-Fi repeater. The module PCB requires to be installed in electrical control box of the heat pump, see below full instructions on how to install the PCB module. This is a fairly straightforward task, but we suggest you download and read these instructions before purchasing this module.