NC Type Wired Door Window Magnetic Security Alarm Contact Sensor Detector Reed Switch Features:<br style="white-space:normal;"> Can be configured with different hosts to issue loud alarm sound and scare off illegal persons. High sensitivity, achieve effective effects of alarming and theft prevention. Normal open and normal close output mode, 15-25mm long working distance, safe and reliable. It is especially designed for shops, shops, garages and other similar places. When the magnet is close to the switch, the reed switch contacts stay close and the signal line is connected. If the door is opened, the magnet leaves the switch, the reed contact is disconnected, and the signal line is interrupted, which is called open circuit alarm. <br style="white-space:normal;"> Specifications:<br style="white-space:normal;"> Condition: <br style="white-space:normal;"> Shell Material: ABS<br style="white-space:normal;"> Shell Color: White<br style="white-space:normal;"> Maximum Switch Current: 0.5A<br style="white-space:normal;"> Maximum Switch Power: 10W<br style="white-space:normal;"> Working Distance: 15-25mm<br style="white-space:normal;"> Output Mode: NC--normal closeWire Length: Approx.&nbsp;29cm/11.4in <br style="white-space:normal;"> Package List:<br style="white-space:normal;"> 1 * Pair of Wired Contact