The house is empty. Someone is still paying attention - Guardian watches any building that stands empty.
Silence is an alarm.
A small wireless kit for any building that spends time empty - which is most of them, most of the time. It senses frost, leaks, power loss and open doors, and it is designed to reach you within seconds of anything sudden, over its own cellular link.
- HUB-01 · MAIN UNITPOWER OK · LTE −97 dBm
- NODE-01 · LIVING42.8 °F (6.0 °C) · BAT 91 %
- NODE-02 · KITCHEN40.6 °F (4.8 °C) · FREEZE WATCH
- NODE-03 · BEDROOM41.2 °F (5.1 °C) · RH 58 %
- PEB-01 · UTILITY ROOMDRY · HEARTBEAT OK
- PEB-02 · BATHDRY
- LATCH-E · EAST DOORCLOSED · 41 d
Whatever stands empty,
watched.
Water finds the floor in January. Frost finds the pipes. Power fails quietly. A house, a workshop, an office over a long weekend - the risks do not care which. Guardian sits in the building year-round and reports over its own cellular connection, and it is designed so that when anything goes wrong, you hear about it within seconds.
- Frost & temperatureFreeze warnings before pipes burst - down to floor level.
- Water leaksPebbles at every wet spot - alarm on contact.
- Power failureDesigned to report in seconds and keep running on battery.
- Humidity & moldSlow-trend alerts, room by room.
- Doors & windows“Did I leave the back door open?” - answered from anywhere.
- Unexpected presenceMovement when nobody should be there.
Silence is an alarm.
If your building stops reporting - cut power, dead battery, a box gone missing - the Guardian cloud alerts you. Every device carries a heartbeat, and the watchdog that listens for them runs on infrastructure independent of everything it watches. It is designed so that it cannot fail quietly.
The storm takes the grid at 2:41:03 AM.
You know at 2:41:12 AM.
An illustration, drawn to Guardian’s design targets: an alert within ten seconds of a power cut, then hourly reports on battery for at least 12 h.
- 9:00:12 PMScheduled report - house 43.2 °F (6.2 °C) · RH 61 % · power ok · all devices reporting.
- 2:41:03 AMPower lost. A winter storm takes the grid along the coast. The hub detects the drop and publishes the event before switching to its backup battery.
- 2:41:09 AMAlert raised - 6 seconds after the grid dropped. Well inside the design target of ten.
- 2:41:12 AMSMS and e-mail delivered. App push sent. No app required.
- 3:41:07 AMBattery heartbeat - Hub at 96 %, house 43.0 °F (6.1 °C). Guardian keeps reporting hourly right through the outage.
- 9:27:44 AMPower restored - outage 6 h 46 min. Backup recharging.
- 9:37:44 AMPower steady for ten minutes. All-clear sent by e-mail and app push.
- 9:40:00 AMSystem nominal. The house never knew you weren’t watching.
The power-out alert, by SMS on Guardian ONE. Calm on purpose.
Four quiet machines.
Turn them over.
One Hub carries the property’s single cellular connection. Two Nodes, a Pebble and a Latch ship with it, reaching it over long-range radio designed to cover the whole building and its outbuildings. More of any of them can join the same link. The Nodes and the Latch hold on with magnets, the Pebble sits on the floor, and the Hub hangs on a small plate with two screws or lies flat on a shelf.
Hub 108 × 108 × 26 mm
Wall-powered with battery backup, cellular built in. The only device in the kit that plugs in.
Node 72 × 54 × 19.5 mm
Any room - temperature, humidity, light and presence. Designed to run two years on two lithium AAA cells.
Pebble Ø45 × 23 mm
Lives at the wet spots - senses water on either face, frost at the floor, and being moved.
Latch 72 × 30 × 17 mm
One in every kit, with a slim magnet bar and shims for old frames. Every open is sent as it happens.
FCC notice for each Guardian device: This device has not been authorized as required by the rules of the Federal Communications Commission. This device is not, and may not be, offered for sale or lease, or sold or leased, until authorization is obtained.
How it goes in.
Place it
Tape the mounts to the wall, set the units on, drop Pebbles at the wet spots. Designed to take five minutes, with no tools.
It links up
Rooms talk to the Hub over long-range radio designed to cover the whole building and its outbuildings.
You hear first
One built-in cellular connection reports to the cloud - alerts by app and e-mail, and by SMS on Guardian ONE.
Built for the empty building,
not the smart home.
| Guardian | Typical smart-home gear | |
|---|---|---|
| Connection | Own cellular link, one SIM per property | The building’s Wi-Fi - which needs wall power |
| Power outage | Designed to alert in under 10 s, then report for at least 12 h on battery | Goes dark with the building |
| When hardware dies | The silence itself raises an alert | Silent failure; you find out in April |
| Sensor battery | Designed for years on lithium primaries rated to −40 °F (−40 °C) | Months, rated for heated rooms |
| Cameras & microphones | None. Not disabled - absent | Camera-first, footage in someone’s cloud |
| Alerts without the app | E-mail on every plan, SMS on Guardian ONE | Push notification or nothing |
“Typical” describes mainstream Wi-Fi security and camera products; specifics vary by vendor.
No camera. No microphone.
Ever.
Not a toggle in the settings. Not a firmware promise. There is no camera and no mic on the bill of materials - so there is nothing to hack, nothing to leak, nothing to subpoena.
What Guardian knows
- The east door opened at 2:41 AM
- The bedroom is 39.4 °F (4.1 °C) and falling
- There is water on the floor by the heater
- The power is out
- Something moved while the building stood empty
What it can never know
- What any room looks like
- What any voice sounds like
- Who anyone is
- What you left on the kitchen table
- Anything a camera would know
Your building stays yours. Guardian reads instruments, not rooms.
When it’s ready for your building, you hear first.
Guardian is in development. If you own, manage, sell or insure a building that stands empty, tell us about it - we’ll write when there is something for you to try.
What you get
An e-mail when Guardian is ready for a building like yours to try.What we keep
What you type here, until you ask us to delete it or we close the list.What happens next
A person reads it and replies.No newsletter, no drip, no salesperson. Or just write hello@kresvik.com
FCC notice for each Guardian device: This device has not been authorized as required by the rules of the Federal Communications Commission. This device is not, and may not be, offered for sale or lease, or sold or leased, until authorization is obtained.