Replacement battery for ProGuard800 Siren. Specifications: 700mAh, 7.2V, Ni-MH. Compatible with: ProGuard800 Siren, ProGuard OS826 siren, Infinite Prime WES Siren. Replaces: Marmitek OS826, Marmitek GP91AAALH6YMX, Marmitek GP11AAAH6YMX, Marmitek INF-BATWES, Marmitek GP1000AAAH6YMX, Marmitek GP150AAAM6YMX and 6 more. Marmitek replacement battery designed for Security System devices.