Potassium channel subunit. Modulates channel activity by shifting the threshold and the half-maximal activation to more negative values. Heterodimer with KCNB1. Does not form homomultimers. Highly expressed in heart, liver, skeletal muscle, kidney and pancreas. Detected at low levels in brain, lung and placenta. The segment S4 is probably the voltage-sensor and is characterized by a series of positively charged amino acids at every third position. Heterodimers with KCNB1 are highly sensitive to inhibition by tetraethylammonium (TEA) and propafenone. Belongs to the potassium channel family. G (TC 1.A.1.2) subfamily. Kv6.2/KCNG2 sub-subfamily.