Featuring a customisable design and accurate detection, VX Shield is a series of short range outdoor intrusion detection sensors providing reliability, convenience and security.The VXS series is used to generate an early intrusion alarm, protecting buildings. sites and roofs. The VXS-AM is the hardwired PIR model with anti-masking. The VX Shield series has been designed to make the installation phase as easy as possible for the installer. With every piece of the installation phase throughout with great precision from the easy 90 degrees rotation lock to open/close the cover to the easy to adjust detection area, we've made what was previously considered the most painful of tasks totally hassle free. The VX Series also includes a "Automatic Walk Test Mode", when closing the cover the walk test mode expires automatically after 3 minutes. ALL VXS models are equip with a digitally enhanced signal recognition logic called SMDA. By analyzing detection patterns and environmental information SMDA improves immunity against various noise factors such as climate changes and vegetation sways, and can distinguish between the cause of nuisance false alarms and genuine intrusions.