Mini curtain PIR detectors: 1.self-checking function 2.high sensitivity 3.non-flammable case 4.Alternate polarity pulse Mini curtain PIR detectors Feature:1. Suitable for door, window, terrace and ceiling protection2. Has the function of self-checking3. Vertical or level sense, high sensitivity,non-flammable case4. Alternate polarity pulse count, one or two pulse can be select5. Environment ...