- This Yale smart door and window sensor instantly notifies you when they're left open - The Yale Home app lets you monitor remotely if they're shut when you're far away from home - It connects via WiFi to detect opening or closing motion and sends insights to your smartphone - Just ask Alexa or Google Assistant to close a window when you're all snuggled up on the couch - Replaceable batteries means you can just pop in new ones when needed The Yale Home Wireless Door & window Contact sensor is an accessory designed to enhance your Yale Smart Alarm kit protecting all the main entry points of your home. Receive real-time alerts via the Yale Home app as soon as someone opens or closes the door or windows. Sleek and slim design makes it perfect for narrow frames of windows and doors. It seamlessly blends into your home decor without compromising on functionality. Enhance your security system and easily monitor the status of your doors or windows with the Yale Indoor Window/Door Contact. Get real time notifications via the Yale home app as soon as someone opens or closes your door or windows. Specifications: Weight: 0.0 kg Colour: White Material: Plastic Model Number: AL-DC-1A-W