System Sensor RTS151KEY, Remote Station For Duct Smoke DetectorCondition:* New Surplus Stock, In Bulk Packaging. As Pictured.Additional Notes:* This fire detector accessory features a multi-colored LED alternating between steady green and red, making it perfect for 4-wire detectors.* It also illuminates red for alarms with 2-wire detectors.* This testing station has a maximum alarm response time of 40 seconds and boasts a compact design, measuring 4.6″ (H) x 2.75″ (W) x 1.8″ (D).* It operates efficiently at a temperature range of -10C to 60C (14F to 140F) and a maximum relative humidity range of 95% non-condensing.System Sensor RTS151KEY