Enables potassium channel activity. Predicted to be involved in detection of calcium ion; neuronal action potential; and potassium ion transport. Predicted to be integral component of plasma membrane. Predicted to be part of voltage-gated potassium channel complex. Orthologous to human KCNMB2 (potassium calcium-activated channel subfamily M regulatory beta subunit 2). [provided by Alliance of Genome Resources, Apr 2022]