Ring Alarm 5-Piece Kit

Expand the reach of your Ring alarm system with help from this contact sensor
Simply mount it to a window or door
link it to your base station (sold separately) and instantly receive notifications on your mobile device whenever they open
Wirelessly connects to your Ring alarm system
Requires the Ring alarm base station (sold separately)
Mounts to most doors and windows in your home
Sends alerts to your connected Android or iOS mobile phone or tablet when monitored doors or windows are opened
Tool-free installation allows simple setup
Includes a 3V lithium battery
Backed by the manufacturer's 1-year limited warranty