The Poolside Tech ATT-CHEM Chemistry Module and Cable Kit for Attendant System is an upgrade module for Poolside Tech Attendant Systems. This set includes a chemistry module and cable set, which consists of an add-on chemistry board and two 25 foot long BNC cables. Connecting these components to your existing Attendant System (sold separately) allows you to receive water chemistry information, such as PH levels and ORP / Oxidation Reduction Potential levels remotely through the system, as well as controlling connected chemical dispensing pumps.