Replacement battery fits 5 LEXUS compatible models. Specifications: 300mAh, 7.2V, Ni-MH. Compatible with: IS200, IS300 Siren, 89040-53011, 89040-53012, IS200 Siren. Replaces: LEXUS 28AAAM6BML. LEXUS replacement battery designed for Siren Alarm devices. Fits like the original manufacturer part.