World’s Longest Wireless Range: Powered By Lora Technology, The Long-range Yet Low-power System Offers The Industry’s Longest Receiving Range In The Market (1/4 Mile). Our Long-range Coverage Enables Its Use In Areas Challenging For Most Residential Wi-fi Systems, Such As Basements, Outdoor Porch/patio Areas, Sheds, Free-standing Garages, Even Remote Outbuildings On Your Property. Doesn’t Work Without Yolink Hub: Yolink Hub Is The Only Central Controller For Yolink Devices, And It Connects Yolink Devices Into The Internet And The Cloud. Yolink App Provides You With Emails, Text Messages And Phone Banner Alerts, Tailored To Your Needs, But The Siren Alarm’s Loud (100 To 110 Decibel) Sounder Can Be Heard From A Distance And Gets Immediate Attention, With Or Without Your Phone Economical And Powerful Siren: This Economical Wireless And Portable Loud 110 Db Smart Siren Adds Audible And Visible Alarms To Your Existing Yolink System Or Can Work Alone As A Panic Alarm (YoLink Hub Required, Not Included).