Side-by-side
GS-21 Underground Sensor vs Hoardfence
Spec comparison for two products on Aviation Souk. Both compete in perimeter-security.
| Cost of ownership | GS-21 Underground Sensor | Hoardfence |
|---|---|---|
| Price tier | — | — |
| Lead time (weeks) | ?–? | ?–? |
| Delivery | — | — |
| Install | — | — |
| GCC airports deployed | 0 | 0 |
| Certifications | 0 | 0 |
Specs
Technical specifications.
| Spec | GS-21 Underground Sensor | Hoardfence |
|---|---|---|
| Sensing modalities | External seismic line strings (pedestrian) + internal magnetic sensor (vehicle presence and travel direction) | — |
| External sensor inputs | PIR (pedestrian/vehicle presence + travel direction) and contact-closure | — |
| Radio | Built-in 5 W VHF, strong foliage penetration | — |
| Radio range | Up to 35 miles line-of-sight | — |
| Battery life | 1+ year | — |
| Output | Mechanical relay to trigger external devices (cameras, lights, sirens) | — |
| Security | Tamper switch | — |
| Timing | Real-time clock; programmable self-test messages and scheduled access windows | — |
| Compatibility | Legacy Vortex and Monitron systems | — |
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