Alarm does not contain battery alarm + one 9v ordinary battery single buy 9v Nanfu battery one grain can be standby for three years 380v three-phase blackout phaseless alarm contains battery alarm + three grain 9v ordinary battery 220v power outage + incoming call sound and light alarm built-in battery upgrade 220v power failure alarm + battery integrated 220v blackout alarm + 9v battery 220v power failure + incoming alarm + battery
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