Side-by-side
Mini Mk3 Seismic & Acoustic Sensor vs GS-21 Underground Sensor
Spec comparison for two products on Aviation Souk. Both compete in perimeter-security.
perimeter-security
Mini Mk3 Seismic & Acoustic Sensor
by exensor
Covert 0.5 kg seismic/acoustic UGS node with 360-degree detection and classification of personnel and vehicles.
perimeter-security
GS-21 Underground Sensor
by vortex-systems
Buried UGS with external seismic line-string support for extended pedestrian detection along a perimeter
| Cost of ownership | Mini Mk3 Seismic & Acoustic Sensor | GS-21 Underground Sensor |
|---|---|---|
| Price tier | — | — |
| Lead time (weeks) | ?–? | ?–? |
| Delivery | — | — |
| Install | — | — |
| GCC airports deployed | 0 | 0 |
| Certifications | 2 | 0 |
Specs
Technical specifications.
| Spec | Mini Mk3 Seismic & Acoustic Sensor | GS-21 Underground Sensor |
|---|---|---|
| Sensing modality | Seismic + acoustic, 360-degree detection and classification | — |
| Targets | Human activity and vehicles (on-node classification) | — |
| Alarm handling | Multiple simultaneous alarm classifications; advanced false-alarm filtering | — |
| Detection-range prediction | Automatic prediction of detection range | — |
| Background noise | Continuous background noise estimation | — |
| Range modes | Local / extended range mode | — |
| Sensor fusion | Fusion over radio with other Flexnet sensors | — |
| Silent mode | Radio-silence mode: alarm data stored in the device until requested or link re-established | — |
| Dimensions (without spike) | 115 x 54 x 100 mm | — |
| Weight | 0.5 kg | — |
| Battery life | 30 days integrated rechargeable; 1-year battery option | 1+ year |
| Radio | Integrated 1 km mesh-networked radio; node relays data from other UGS (Mini/Scout/PIR) | Built-in 5 W VHF, strong foliage penetration |
| Encryption | AES-256 | — |
| Positioning | Internal GPS receiver for self-location | — |
| Anti-tamper | Built-in anti-tamper with GPS | — |
| Operating temperature | -32 to +71 degC | — |
| Environmental standard | MIL-STD-810 | — |
| EMC standard | MIL-STD-461 | — |
| 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 range | — | Up to 35 miles line-of-sight |
| 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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