Shop System Sensor Wired Strobes at GeoArm Security. Browse hardwired LED, wall-mount, ceiling-mount, indoor, outdoor, weatherproof, and multi-candela fire alarm strobes designed to provide reliable visual notifications for compatible fire alarm systems. System Sensor-compatible wired strobes support fire alarm systems eligible for GeoArm 24/7 professional UL-listed central station monitoring with no long-term contract.