OVERGUARD S1

The smart helmet pod that connects your workforce.

A compact electronics pod that retrofits onto any EN 397 certified safety helmet in 30 seconds. No tools. No new helmets. Just clip it on and go live.

165gadded weight
30 secondfit time
Retrofits to any EN 397 helmet
165g
Total added weight
12h+
Battery life per shift
IP67
Dust & water protection
30s
Time to fit any helmet

Always connected. Always protected.

PRIMARY
LTE-M / 4G Cellular
Built-in SIM. Direct to cloud. No phone needed.
SECONDARY
Bluetooth 5.2
Pairs with supervisor and worker apps for sync.
REMOTE
LoRaWAN
For underground and remote sites. 15km gateway range.
View full specifications →

The Overguard S1 — Every detail.

GPS + GNSS
2-3m outdoor accuracy
Fall Detection
6-axis IMU · Edge ML
LTE-M + 4G
Direct cellular · No phone needed
LED Status Ring
12 LEDs · Haptic feedback
SOS Button
One press · Emergency protocol
IP67 · ATEX Zone 2
Dust & waterproof · -20° to +60°
12h+ Battery
3,000mAh · Magnetic dock
Environmental
Gas · Noise · Temp · Air quality
Clip to helmet
Attaches to any EN 397 helmet rear band. No tools needed.
Scan & provision
Scan the QR code in the Overguard app. Online in seconds.
Assign to worker
Link to worker identity from the workforce register.
Go live
Worker appears on site map. All sensors active immediately.

From box to live in minutes.

01
Clip to helmet
The S1 pod attaches to the rear stabiliser band of any EN 397 helmet. No tools needed.
02
Scan QR code
Supervisor scans the QR code on the pod using the Overguard app. Device is instantly provisioned to the platform.
03
Assign to worker
Assign the device to a worker from the workforce register. Worker identity, trade, and employer linked in seconds.
04
Go live
Device appears live on the site map. All sensors active. Safety monitoring begins.
SENSOR STACK

Every sensor. Every environment.

Motion & Safety
6-axis IMUFall detection MLImpact measurementMan-down detectionTilt monitoring
Location & Positioning
GPS + GLONASS + GalileoBLE 5.2 meshUWB precision (optional)Geofence engine
Environmental
4-gas detection (O2,CO,H2S,LEL)Continuous noise dB-ATemperature & humidityAir quality PM2.5/PM10UV exposure
Consent required
Biometric
Heart rate (optical PPG)Skin temperatureFatigue scoring algorithm
Communications
LTE-M / NB-IoT4G LTE fallbackBluetooth 5.2LoRaWANNFC provisioning
Processing & Storage
ARM Cortex-A application processorARM Cortex-M4 always-on safety core72h local data bufferOTA firmware updatesSigned firmware + rollback protection

Certified for the most demanding environments.

Every certification your site requires, built in from day one.

EN 397:2012+A1
EU Safety Helmets
Primary helmet certification
ANSI/ISEA Z89.1
US Head Protection
North American compliance
IP67
Ingress Protection
Dust-tight, 1m immersion
ATEX Zone 2
Explosive Atmospheres
Oil, gas, mining safe
CE + UKCA
Market Conformity
UK and EU sales compliance
MIL-STD-810H
Military Standard
Extreme environment tested

Full technical specifications.

Physical
Dimensions85 × 55 × 28mm
Weight (pod only)165g
HousingPolycarbonate + TPU gasket
Colour optionsMatte black / Hi-vis yellow
Operating temperature-20°C to +60°C
Drop rating2 metres
Power
Battery capacity3,000mAh LiPo
Continuous operation12+ hours (full sensor mode)
Extended mode18+ hours (reduced polling)
ChargingMagnetic pogo-pin dock + USB-C
Fast charge80% in 45 minutes
Battery monitoringState of charge reported to platform
Connectivity
PrimaryLTE-M / NB-IoT (embedded SIM)
Secondary4G LTE (high-bandwidth fallback)
LocalBluetooth 5.2
Remote sitesLoRaWAN (site gateway required)
ProvisioningNFC + QR code
Firmware updatesOTA (signed, rollback protected)
Location
Outdoor GNSSGPS + GLONASS + Galileo
IndoorBLE 5.2 mesh triangulation (anchor beacons)
Precision indoorUWB module (optional, <30cm accuracy)
Geofence processingOn-device edge compute
Position update rateEvery 5 seconds (configurable)
Processing
Safety processorARM Cortex-M4 (always-on)
Application processorARM Cortex-A
Local storage72 hours of full sensor data
Edge MLFall detection, fatigue indicators
OSFreeRTOS (safety core)
Certifications
Head protectionEN 397:2012+A1 / ANSI Z89.1
Ingress protectionIP67
Explosive atmosphereIECEx / ATEX Zone 2
Market conformityCE / UKCA
Environmental testingMIL-STD-810H

Ready to deploy Overguard S1 on your site?

Hardware ships within 5 working days. Pilot setup included at no cost.

Request a pilot →