Replacement battery fits 11 DSC compatible models. Specifications: 16000mAh, 3.6V, Li-ion. Compatible with: Visonic SR-740 PG2, Visonic SR 720 PG2 sirens, Visonic MCS-740 siren, Visonic MCS-720B, Siren Res Fire, Burg Siren and 5 more compatible models. Replaces: Visonic 2XER18505M, DSC 2XER18505M, TYCO 2XER18505M, FANSO 103-304742. DSC replacement battery designed for Emergency Lighting devices.