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BRK 10-Year Battery Hardwired (with Battery Back-Up) Ionization Interconnected Smoke detector

First Alert BRK 10-Year Battery Hardwired (with Battery Back-Up) Ionization Interconnected Smoke detector

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Is this a plug and play direct replacement for the older 4120B? Thank you


Thank you for your question. The same wire harness can be used. The mounting bracket will need to be changed. If you have any additional questions or concerns, please don`t hesitate to reach out to our Consumer Support team at First Alert.at 1 (800)-323-9005.

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