Reflective Beam Detector, Model: SRA-24 Examples of some applications where Reflective beam smoke detectors have been successful used include: Factory, Gymnasium, theatre, museum, tunnel, warehouse, church, etc… The unit is not suitable for applications where strong or reflected sunlight is present. SPECIFICATION Rated Voltage: 15-33 VDC Standby current: 350 µA at 24VDC Alarm current: 50 mA max. at 24VDC Protection Range: 25 ~ 100 feet Operating temp. range: -14ºF ~ +122ºF