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The Directed Electronics 508D Field Disturbance Sensor is a dual-zone sensor using RF field-disturbance technology to detect moving high-density objects. It interfaces directly with an optional 516U Vocalarm module or any Directed Electronics system offering a multiplex input for perimeter-intrusion response.
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| Brand | Directed Electronics | Directed Electronics | Directed Electronics | Black Box Corporation | Safety Technology International | Generic Logic, Inc. |
| Price | €38.90 | €18.09 | €36.18 | €182.21 | €21.70 | €71.92 |
| Seller | Newegg | Newegg | Newegg | Newegg | Newegg | Newegg |
| Update | Nov 13, 2026 | Nov 13, 2026 | Nov 13, 2026 | Nov 13, 2026 | Nov 13, 2026 | Nov 13, 2026 |
| Part Number | 508D | 506T | 3121T | 2885569 | STI-3551 | 564167870994 |
| Product Type | Field disturbance sensor | Audio glass break sensor | Powersports security system | Motion detection sensor | Wireless entry alert sensor | Wireless outdoor driveway alarm system with motion sensor and detector |
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