Voltage-gated chloride channel. Chloride channels have several functions including the regulation of cell volume; membrane potential stabilization, signal transduction and transepithelial transport. May be important in urinary concentrating mechanisms. May be the basolateral chloride channel mediating net chloride absorption in CTAL cells. Interacts with BSND. Forms heteromers with BSND in the thick ascending limb of Henle and more distal segments. Specifically expressed in the kidney. All nephron segments expressing BSND also express CLCNK proreins. Due to intron retention. Belongs to the chloride channel (TC 2.A.49) family. CLCNKB subfamily.