The Smart Mailbox That Delivers Emergency Alerts to Your Curb.
SignalPost transforms the everyday mailbox into a smart curbside communication upgrade — providing at-a-glance weather awareness, guiding first responders to the right home, sharing city and county utility advisories, notifying you when mail arrives, and upgrading your curb appeal to a modern look.
Why current systems fall short.
Traditional outdoor warning sirens were built for another era. They can be difficult to hear indoors, are often misunderstood, and provide little guidance beyond the initial alert. As communities face more frequent severe weather and evolving public safety challenges, the need for a modern, visual awareness system has never been greater.
Sirens weren't designed to reach you indoors.
Outdoor sirens lose up to half their reach during storms — and modern insulated homes block what's left.
Most systems fail when the grid goes down.
When power goes out, every smart device, phone charger, and Wi-Fi router goes silent — taking your alerts with them.
Too expensive to replace — or add more.
A single siren replacement runs $30K–$100K — and much of the country's aging siren network is already past its useful life.
A siren tells your county there's danger. A phone notification gets swiped away. SignalPost tells your household what's happening, what to do, and confirms it with a visual signal you can't miss — right at the curb.
Transforming the Curb into a Lifeline.
Runs on Solar
100% solar-powered with battery backup. No wiring, no electrician, no outlet — it works when the power doesn't.
Verified Emergency Alerts
Receives official IPAWS alerts (the same system used by FEMA) over cellular — filtered to your exact location, not the whole county.
Speaks, Not Just Screams
Clear voice instructions tell you what's happening and exactly what to do — not just a vague siren tone.
Visible From the Street
A 360° LED beacon visible from 500+ feet — your neighbors see it, first responders see it, everyone acts.
Three layers of protection. Zero grid dependency.
Charges Itself
An integrated solar panel and battery provide extended autonomous operation — no wiring, no electrician, no outlet.
Receives Geofenced Alerts
A built-in cellular modem receives verified IPAWS emergency alerts — tornado warnings, flood alerts, evacuation orders — in seconds.
Creates Unmissable Awareness
The LED halo activates — visible from 500+ feet — while a speaker broadcasts clear voice instructions.
Built for two kinds of neighbors.
Your mailbox, upgraded.
Knows when mail arrives
Get notified the moment mail is delivered. No more guessing or unnecessary trips to the curb.
Locks for security
A locking mailbox keeps your mail safe from theft. Access it from the yard side — no leaning into the road.
Delivers emergency alerts
When a tornado, flood, or wildfire warning is issued for your area, SignalPost sounds a clear voice alert and lights up — even if your power is out and your phone is dead.
Visible day and night
A built-in LED beacon doubles as ambient curb lighting after dark — and activates as a bright visual alert during emergencies.
Runs on solar
No wiring, no electrician, no outlet. Installs on your existing mailbox post. Charges itself. Works when the grid doesn't.
Curb appeal that turns heads
A sleek, modern design that looks like a deliberate upgrade. Neighbors will ask where you got it.
Alerts that reach the curb, not just the county.
Portal for hyperlocal alerts
Send targeted alerts to specific blocks, streets, or neighborhoods through the SignalPost management portal. No more county-wide blasts that everyone ignores.
Mass reach, zero infrastructure cost
Residents buy and install their own units. Your city gains a distributed alert network without capital expenditure — no new towers, no trenching, no maintenance budget.
Neighborhood mesh coverage
As more homes on a block install SignalPost, the visible and audible coverage overlaps — creating a mesh of awareness across the neighborhood.
Guides first responders to the right house
When a 911 call is placed, the unit at that address can activate its beacon — so police, fire, and EMS can visually identify the exact home. Less guesswork, faster response.
Non-emergency advisories too
Boil water notices. Water conservation alerts. Road closures. Street-level advisories that don't warrant a siren but still need to reach residents — delivered right to the curb.
Works when everything else fails
Solar-powered and cellular-connected. When the grid goes down and phones go dark, SignalPost units stay on — reaching people that sirens and smartphones can't.
Real failures that define the problem we're solving.
Tornado Sirens Failed to Activate — Despite Being Tested the Day Before
During a May 2025 EF-3 tornado outbreak, a city's entire siren system failed to sound. Residents received no text alerts. The sirens had been tested successfully just 24 hours earlier — yet when the real threat arrived, the system went silent. This is the exact failure mode SignalPost is designed to address — a curbside alert node that receives verified alerts directly and responds automatically, without human activation.
Read the full story →Hurricane Helene: Millions Without Power, Every Grid-Dependent Alert Went Dark
In 2024, U.S. electricity customers experienced an average of 11 hours of interruptions — nearly double the prior decade. Three hurricanes accounted for 80% of all outage hours. When the grid fails, every smart device, phone charger, and Wi-Fi router goes silent. Grid-independent alert infrastructure at the curb would remain operational through these outages — the core design principle behind SignalPost.
Read the full story →Hurricane Beryl: Millions Lost Power, Utility Communication Collapsed
When Hurricane Beryl struck Texas in July 2024, nearly 3 million people lost power. The utility provider faced widespread criticism for delayed communication — some areas went over a week without electricity and without clear information. When both sirens and phones fail simultaneously, the gap in last-mile alert delivery becomes a life-safety issue. SignalPost is being engineered to operate independently of grid power and cellular network congestion.
Read the full story →Bring SignalPost to your community.
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