Built-in reed switch works with 2.4G RF and connects to your existing home Wi-Fi network, with a slim design that’s ideal for narrow jamb doors and windows. Make sure your doors and windows are shut so that pets can’t escape and valuables are safe or you can even use thesensors on closet doors and drawers.With the convenience of the IC-5170SC you’ll be informed with video alerts when your loved ones arrive or leave home. No worries about leaving a back door ajar or the side windows open at night, and get immediate warnings when the door or windows are opened byexterior forces.- Instant video alerts.- Slim design to fit narrow jamb doors and windows.