TD04 Power Failure Alarm 220V (without battery) TD04 Power Failure Alarm 220V (with normal battery) TD04 Power Failure Alarm 220V (with rechargeable battery) SF21 Power Failure Alarm 220V (Upgraded version with ordinary battery) SF21 Power Failure Alarm 220V (Upgraded version with rechargeable battery for 10 years without battery replacement)
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