Anion-selective channel permeable to small monovalent anions with ion selectivity for chloride > bromide > nitrate > iodide (PubMed:11734858, PubMed:12111250). Forms a homodimeric channel where each subunit has its own ion conduction pathway. May conduct double- barreled currents controlled by two types of gates, two fast gates that control each subunit independently and a slow common gate that opens and shuts off both subunits simultaneously (PubMed:11734858, PubMed:12111250, PubMed:16849430, PubMed:18776122, PubMed:19646679). Assembles with the regulatory subunit BSND/Barttin for sorting at the basolateral plasma membrane domain and functional switch to the ion conducting state. CLCNKB:BSND channels display mostly a linear current- voltage relationship controlled by common gate (PubMed:11734858, PubMed:12111250, PubMed:16849430, PubMed:18776122, PubMed:19646679). Mediates chloride conductance along nephron segments, namely the thick ascending limb of Henle's loop, convoluted tubule and the collecting duct, contributing to the maintenance of systemic acid-base and electrolyte homeostasis (By similarity). Conducts chloride currents in the stria vascularis of the inner ear to establish the endocochlear potential necessary for normal hearing (PubMed:15044642, PubMed:18310267, PubMed:19646679). {ECO:0000250|UniProtKB:Q9WUB6, ECO:0000269|PubMed:11734858, ECO:0000269|PubMed:12111250, ECO:0000269|PubMed:15044642, ECO:0000269|PubMed:16849430, ECO:0000269|PubMed:18310267, ECO:0000269|PubMed:18776122, ECO:0000269|PubMed:19646679}. This is the function of CLCNKB (chloride voltage-gated channel Kb, Ensembl gene identifier ENSG00000184908).