Yolink Lora Smart Door & Window Sensor 3 Pack: Door Left Open Reminders, Up To 1/4 Mile Open Air Range, Up To 5 Year Battery Lif

'Yolink'' Is A Proprietary Wireless Technology Provided By Yosmart. Which Is Based On Semtech'S Lora Wireless Technology Combined With The Yosmart Smart Home/Building Protocol, To Provide The Most Advanced Smart Home/Building Devices Solution. Compared To Wifi, Bluetooth, Zigbee, Z-Wave, And Other Smart Home Protocols, It Has The Advantages Of Low-Power Consumption, Long-Distance Coverage (Wall Penetration), And Anti-Interference. It Is The First Smart Building/Home Protocol That Can Be Very Easily Set Up And Is A Very Low Cost But Creates A Reliable, Robust, And More Secure Iot Network. Requirements: 1. A Yolink Hub (Sold Separately, Used To Connect Yolink Outdoor Motion Sensor To The Internet And The Cloud). 2. A Smartphone Or Tablet Running Ios 9.0 Or Higher, Android 4.4 Or Higher.