Designed for use with the X10 SecuriLINK Console the X10 SMART Wireless Door/Window Sensor allows you to monitor any door window or other open/close object in your home. When the object is opened the battery-powered sensor triggers your security console to immediately sound the alarm activate the voice dialer and flash the lights. How It Works: The X10 SMART Wireless Door/Window Sensor consists of two components: the sensor and the magnet. The sensor installs on the door/window frame and the magnet installs on the door/window itself. When the door/window is opened the two components separate and trigger an alarm at the SecuriLINK Console. FEATURES: Slimmer sleeker SMART design. Triggers alarm when tampered with. Random digital security coding. CONTENTS: Sensor Magnet Mounting Screws. NOTE: Requires two AAA batteries (not included).