Enables acetylcholine receptor binding activity and acetylcholine receptor inhibitor activity. Acts upstream of or within acetylcholine receptor signaling pathway. Predicted to be located in membrane. Predicted to be anchored component of membrane. Predicted to be active in plasma membrane. Is expressed in central nervous system; dorsal root ganglion; and sensory organ. Orthologous to human LY6H (lymphocyte antigen 6 family member H). [provided by Alliance of Genome Resources, Apr 2022]