This system consists of a GS510DZ control box (kW), a VL801D touch panel (18.7cm x 8.3cm) and 5 cables in total, 1 x 2 speed pump cable, 3 x 3 core cables for the circ pump / blower or ozone cable and a 2 pin light cable. This panel is programmable, which means you can set the time that it filters using the mode / program button. This system is made of M7 Technology which is a Balboa twin sensor control system, this means you don't need to drill a hole for a temperature thermostat, their is no pressure switch or high limit sensor, the system works by sensing the difference between the two thermostats, pre heater is the current temperature post heater is the hi limit and if both sensors are the same the element is working. The M7 systems are great for upgrades on hot tubs because their so easy to fit into a system, this also applies if your building a hot tub from new. If you need more help getting the right Balboa parts then please get in touch.The item "Balboa GS510DZ Complete Control System and VL801D Panel Hot Tub DIY Upgrade" is in sale since Friday, July 6, 2018. This item is in the category "Garden & Patio\Swimming Pools & Hot Tubs\Hot Tubs". The seller is "tmc_uk_rdeamxp" and is located in Duns. This item can be shipped worldwide.