Radar vs. wearables vs. cameras

If you're trying to keep a loved one with dementia safe at home, you'll quickly run into three options: a wearable they put on, a camera you watch, or a radar sensor on the wall. Each can help — but they're not equal, and the right choice usually comes down to one question: will it still work on the night it's actually needed?

Wearables (pendants, watches, buttons)

The promise: the person presses a button, or the device detects a fall, and help is summoned.

The catch with dementia: wearables only work when worn — and that's exactly where they break down. People living with dementia frequently take them off, lose them, leave them uncharged, or simply forget they exist. A pendant on the nightstand protects no one, and a person who has fallen may not remember to press it. For early, mild situations a wearable can still add value; for moderate-to-advanced dementia, compliance is the fatal flaw.

Cameras

The promise: you can see what's happening, any time.

The catch: a camera in a bedroom or bathroom is a real intrusion on dignity and privacy, and most families — and many facilities and regulators — are deeply uncomfortable with it. It also depends on someone actually watching the feed at the right moment, which overnight rarely happens. Cameras can suit shared living areas, but in the private spaces where night falls happen, they're often a non-starter.

Radar

The promise: a small wall-mounted sensor detects a fall and unusual activity and sends an alert — without anything to wear and without recording images.

How it's different: radar senses motion and breathing as signals — range, velocity, and angle — not as pictures. There's nothing for the person to put on, charge, or remember, so the compliance problem disappears; and because no camera or microphone is involved, it can go into bedrooms and bathrooms where cameras can't. The trade-off is that contactless radar monitoring is a newer category, so look for honest claims, independent validation, and a risk-free way to try it.

Putting it side by side

• Works with zero effort from the person: radar yes · wearables no · cameras yes
• Protects privacy (no images): radar yes · wearables yes · cameras no
• Suitable for bedroom & bathroom: radar yes · wearables yes · cameras no
• Automatic fall detection overnight: radar yes · wearables partial · cameras only if watched

So how should you choose?

Match the tool to the stage and the space. For a mostly-independent person who will reliably wear a device, a wearable may be enough. For shared living areas where privacy is less of a concern, a camera can help. But for the private, overnight spaces where the most dangerous falls happen — and for anyone who won't reliably wear a device — passive, privacy-preserving radar is the option built for exactly that gap.