GSM Alarms — Outbuildings & Remote Sites

Text-message intruder alerts, remote gate and pump switching, and condition warnings for buildings with no landline.

Out at the far end of a holding, a barn, store, pump house or gateway rarely has a phone line or broadband going anywhere near it — yet it still wants watching. Our 4G alarm and controller units bridge that gap using nothing but a SIM card and the mobile network. They text your phone the moment someone trips an intruder sensor, let you swing a gate or fire a borehole pump open by sending a message back, and warn you the second a grain-store temperature climbs or the mains drops to a chiller. One small weatherproof box, a SIM with a few pounds on it, and a building miles from the farmhouse is suddenly under your eye and under your control from the kitchen table or the cab of the tractor.

Key features

• Texts You When Triggered. Wire in a PIR, a door or shed contact or a beam, and the unit fires a text straight to your phone — and up to several other numbers — the instant the barn or store is disturbed.
• Switch Gates & Pumps By Text. Send a short message back to open a yard gate, kick a borehole or irrigation pump on, knock a parlour heater up or drop a feed auger — no app login, no fuss.
• Relay Outputs To Match The Job. 2, 4 or 8 separately switched outputs so one box can handle the gate, the pump, a light and an alarm bell at the same time without crossing wires.
• Sensor Inputs For Real Conditions. Take readings from temperature probes, water-level floats, door contacts and movement detectors so the unit watches the things that actually go wrong on a remote site.
• Power-Fail & Temperature Warnings. Get an immediate text if the mains drops or a store, chiller or lambing-shed temperature drifts out of range — the difference between a phone call and a spoiled crop or lost stock.
• Runs On A Cheap SIM. Built around plain texts and a trickle of data, so a basic pay-as-you-go SIM with a fiver on it keeps a building covered for months. No broadband, no WiFi, no line rental.

Which SIM and how much data?

These units take any standard UK SIM — EE, Vodafone, O2 or Three — so you can put in whichever network actually reaches the barn or store in question. The box is unlocked, so bring your own pay-as-you-go or contract SIM, or take a pre-set one from us. As the work is mostly texts and a dribble of data, a basic pay-as-you-go SIM with five to ten pounds on it normally runs for months between top-ups.

If you lean on the smartphone app to check status or trigger outputs rather than texting, reckon on roughly 100 to 500 MB a month depending on how often you're dipping in. For anything you can't let fail — a cold store, a grain dryer, a lambing-shed alarm — dual-SIM models are worth it: if the main network drops over the valley, the unit falls back to the second SIM and keeps alerting and switching without a break.

Frequently asked questions

Does it need broadband or a phone line?

No. The unit works entirely over the mobile network using texts and a little 4G data, which is exactly why it suits a barn or pump house with no line running to it. Drop in a SIM, power it up and it's working — no Openreach, no trench up the lane.

How many things can one box look after?

Each controller carries 2 to 8 switched outputs, so a single unit can mind the gate, a pump, a light and an alarm together. If you've got several buildings spread out, you can run a unit at each and manage them all from the one phone.

Will it warn me automatically, or do I have to check it?

It warns you. Wire in a temperature probe, a door contact or a power-fail input and the unit texts you the moment your threshold is crossed — you don't have to remember to look, which is the whole point on a site you only visit now and then.

What does it cost to keep running each month?

Very little. Because it leans on texts and barely any data, a basic pay-as-you-go SIM with five to ten pounds of credit on it usually lasts several months before it needs topping up.

Is it a big job to get going?

No. Slot in the SIM, wire your gate, pump or sensor to the outputs, then send a text or tap the app. Most people have a unit set up and tested inside an hour, with no electrician on a basic 12V install.

Will it survive being mounted in a draughty barn or outside?

Yes. Weatherproof enclosures are available for outdoor and exposed mountings, and the units are built to shrug off a British winter in an unheated store or pump house year-round.

What happens if the signal drops out at the building?

Commands queue and the unit reconnects on its own once signal returns. For a building where you can't afford a gap — a chiller or a stock shed — dual-SIM models hop to a second network automatically so the alerts keep coming.