Potassium channel subunit. Modulates channel activity (By similarity). Heterodimer with KCNB1. Does not form homomultimers (By similarity). The segment S4 is probably the voltage-sensor and is characterized by a series of positively charged amino acids at every third position. Belongs to the potassium channel family. G (TC 1.A.1.2) subfamily. Kv6.2/KCNG2 sub-subfamily.