Voltage-gated potassium channel that opens in response to the voltage difference across the membrane, forming a potassium-selective channel through which potassium ions pass in accordance with their electrochemical gradient (PubMed:7993631). The channel displays rapid activation and inactivation kinetics (PubMed:7993631). . This is the function of ENSG00000116396 (KCNC4, potassium voltage-gated channel subfamily C member 4).