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