Silent.
Signal.
Sentinel.
SheShield Sentinel is a phone-independent wearable that lets her alert trusted people before a situation becomes an emergency. Dedicated Cellular (LTE-M) and GNSS right on the wrist.
Most safety devices start after the attack begins.
Conventional response
SheShield response
“She simply wants someone she trusts to know where she is and be ready.”
One quiet device.
Three clear states.
SAFE
Normal operation. Low power, ready, with trusted contacts already configured on device.
WATCH
A discreet triple press shares live location. No loud alarm, completely silent, and always cancellable.
EMERGENCY
A long press locks GNSS, records available evidence and alerts trusted contacts via Cellular (LTE-M).
Normal journey
“Safety Watch activated. Live location available.”
“Emergency alert activated. Live location and available evidence are being shared.”
Wearable unit & guardian companion dashboard.
Slide Drawer · 5 Wallpapers · Crown/Side Buttons · Ringing Audio
Updated now via Cellular (LTE-M) + GNSS
Safe perimeter maintained · No anomalies
Sentinel ready · Cellular (LTE-M) + GNSS active
What happens after a trigger.
Safety Watch
Discreet trigger
Vibration confirmation
Watch mode active
GPS location
Guardian alerted
Continuous updates
Emergency
Long press
Silent confirmation
GPS lock
Available evidence
Cellular alert
Contacts receive context
Quiet on the wrist.
Clear to guardians.
30s SOS Grace Window
Real-time depleting countdown arc with hold-to-disarm slider to prevent false emergency dispatches.
Cellular Dialer & Ringing Audio
Direct Quad-Band SIM800L audio calls with 440Hz/480Hz dual-cadence telephone ringback synthesis.
watchOS 10 Control Center
High-density status bar (Jio 4G CSQ bars, battery pill), 6 frosted squircle tiles, volume slider & SOS strip.
5 AMOLED Wallpapers
OLED Pitch Black, Ultra Topographic Contours, Cosmic Aurora, California Sunset Gradient & Cyber Matrix.
105dB Sound Studio
ES8311 DAC high-output sirens: Police Wail, 105dB Pulse, Ambulance Hi-Lo, Chirp Radar and Chimes.
3-Mode OLED Torch
Ultra-bright White 100%, Amber Warm night reading, and Red Strobe Emergency beacon.
Night Walk Guard
Continuous Neo-6M GPS NMEA telemetry, heading 042° NE, and automated 30s guardian pings.
Guardian Direct Sync
Pre-authorized directory with 1-tap priority calling and instant GPS coordinates via SMS.
Independent by design.
Privacy is part of safety.
SheShield is intentionally designed to create a useful record only when the wearer asks for help. No passive surveillance, no ambient snooping.
Evidence only after a user-triggered event
User-configured trusted contacts only
End-to-end encrypted cellular transmission
Authenticated guardian-only dashboard access
Strict limited retention with automatic purge
Zero continuous recording or background surveillance
Environmental context, never biometric identification
Designed around the moment.
She feels followed after work. A discreet triple press quietly starts Safety Watch and streams live location to Mom without escalating tension.
Credibility means naming the limits.
These technical limits make the prototype engineering credible, responsible, and practical for real deployment.
Build the core first.
Prove the silent safety path.
ESP32-S3 class MCU · GNSS · Cellular (LTE-M) · Tactile Button · Vibration motor · MEMS Mic · Basic camera
- Watch + Emergency activation
- GPS / GNSS transmission
- Contact notification via Cellular
- Live location companion interface
- Timestamped telemetry logging
Add context carefully.
Discreet voice keyword activation · Thermal human presence sensing · Edge ML classification · Encrypted cloud evidence storage · Guardian companion mobile app