Easily expand home security with SATCO NUVO'S Smart Doorbell with Remote Chime. This complete doorbell system comes with a rechargeable battery that charges automatically when hard wired. Motion detection sends alerts directly to your mobile device allowing you to view historical events and live events in real time, from anywhere. The included chime plugs into standard 120V outlets, making the doorbell audible, even if your mobile is on silent. Best of all, no subscription fees, ever.