Model JTY-GD-2151EIS is a conventional intrinsically safe photoelectric smoke detector uses state-of-the-art sensing chamber. The detector is designed to provide open area protection and is for use with 2-wire control panels via interface module. Each detector is equipped with two LEDs that provide a local, visual indication of detector status. Once the detector senses a fire, it latches on in alarm and remains the state until it is reset by a momentary power interruption. The detector can be tested by activating an internal reed switch with a test magnet.