ihocon: First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup 偵煙警報器Amazon 現在First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup 偵煙警報器 原價 $23.99, 特價 $11.67, 節省 $12.32(51% Off)

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