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