CIOKS 4 is the perfect choice for CIOKS DC7 in case you would like four additional outlets with four selectable voltages (9, 12, 15 and 18V DC) which can each deliver 660mA at 9V DC. Simply connect CIOKS 4 to your DC7 via the courtesy 24V outlet. Via its 5V USB C input CIOKS 4 can even be powered by connecting a USB powerbank to the unit or by using your tablet power supply.