The cable is for the DIY folks out there. This cable connects to the 24VDC accessory connections on the 1LINK. This cable has two bare (tinned) wires on the other end so you could connect it up to a 24VDC device of your choosing so long as it draws no more than 35W. Examples might include a solenoid valve or a fan. This accessory port can be switched on and off just like an EB8 outlet.