Idea Product Spotlight
Reliance Controls THP207 Plug-In Power Failure Alarm with LED Flashlight,White
A small unit that plugs into an outlet and sounds a loud alarm the instant your power goes out -- built specifically to alert you (even if you're asleep or in another room) rather than to light a room, with a built-in flashlight as a secondary function.
Most people only find out the power is out when they notice the lights are off or the fridge feels warm -- a device whose whole job is to alert you the moment it happens isn't something people know to search for; they'd think 'smoke alarm' or 'security system,' not 'power failure alarm.' 230 reviews at 4.3 stars for a specific, honest niche.