Wake you up on important mornings so you're never late again. ⏰【Battery Operated】Silent alarm clocks, powered by one AA battery (not included), easy to load battery and keeps really good time.

[Brad] was asked by his Sister to design a motion-based alarm that would help her catch ... that is only active at night and can be battery-powered. What he came up with is a light-sensitive ...

Basic alarm clock & battery operated clock - This clock is powered by 4 x AA alkaline batteries only (not included), which can keep Constantly Big 1.2'' LED digit time display for more than 12 months.

They also tell you which room the fire is in. The First Alert SM500V Interconnected Battery-Operated Smoke Alarm with Voice Alerts offers the most complete early warning system of any smoke alarm ...

When [Adam] started looking at commercial freezer alarms, he found that most of them are a joke. A bunch are battery-powered, and many people complain that they’re too quiet to do any good.

Test your alarms once a month; that goes for hardwired as well as battery-operated models. Replace the batteries at least once a year. Keep spare batteries in the house so people won't be tempted ...

Installation: You can mount battery-powered detectors on your ceiling with a pair of wall anchors. If you have an existing ceiling mount for a hardwired alarm, you can fit those in easily.