This DewBuster dew controller is configured with 4 full power ports, 4 medium power ports and two thermostat sensor ports.
Fitted at the moment with a 2.5 metre lead, cigarette lighter plug and 3Amp fuse, but can be converted to be connected directly to batteries with spade or loop terminals if you prefer.
Selling for $150 as fitted with Cig Plug. (Postage $10)