current item | |||
Power Source | |||
---|---|---|---|
Plug-In | Plug-In | Plug-In | Battery |
Alarm/Detector Features | |||
Battery Back-Up, Digital display | 10-Year Battery, Battery Back-Up, Digital display, Hush Button, Tamper Resistant | Battery Back-Up, Digital display | Hush Button, Tamper Resistant |
Pack Size | |||
1 | 1 | 1 | 6 |
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