Description :  <br>5 Set Recessed Door Window Contacts Magnetic Reed Security Alarm Switch Screws<br>Features :  <br>Easy installation ! Reliable performance ! Good characteristic of abrasion-proof ! Best Choice for you to protect family ! <br>There are two types of reed switches : &amp;quot;normally open&amp;quot; reed switches and &amp;quot;normally closed&amp;quot; reed switches.The metal reeds on a normally open switch stay open when there is no magnet near the switch.In the presence of a magnetic field， the contacts of a normally-open reed switch will close.A normally-closed reed switch is closed when it is not near a magnet; as a magnet is brought close to it， a normally-closed switch will open.<br>Specification : <br>Color : whiteMaterial : ABSDimensions : 27(mm) X 14(mm) X 8(mm)Switch pattern : N\/O normally open， alarm-on-brokenContact capacity : Maximum switch current : 0.5AmpVoltage : 200 VDCRated power : 10WActuation distance : 20-25mmWire lead : 22 Awg， About 350mm longMounting method : SMD (by screws or double-sided tapes)Recommendations in application : wooden door， window<br>Package Includes :                                                                                                                                                                                                    <br>5 x Reed switchesNecessary screws for installation<br>Details pictures :