About this replacement
Designed for DSC, TYCO, Visonic devices. Compatible models include Siren Res Fire, Burg Siren, PG9901, Siren PG9901, Siren PG9911, Wireless Indoor Siren Res Fire, MCS-740 siren, MCS-720B, SR-740 PG2, SR 720 PG2 sirens. Replacement part numbers include 2XER18505M, 103-304742. Key specifications: 3.6V, 16000mAh, Li-SOCl2.