FeaturesFull HD video with 140-degree viewing angleCompatible with iOS / Android2-way audio communicationIntegrated lithium battery power source and low battery alertInfrared night mode turns on automatically in low lightThe TCP Smart WiFi Video Doorbell with Battery allows you to get instant motion alerts, so you never miss a visitor and no subscription is required. The doorbell has exceptional picture quality, a noise-cancelling microphone and a smart PIR sensor with low, medium and high sensitivity to keep you safe. TCP Smarts Wi-Fi Doorbell has live view, playback or download at any time from anywhere so you will always be able to see what is going on. Simply download the TCP Smart App from the Apple Store or Google Play, connect your doorbell then add your device to the App. No additional hub is required, and the product connects securely throughout your existing Wi-Fi. Works on 2.4 GHz Wi-Fi only - if you have a dual-band router please set to 2.4 GHz network to pair. Easy installation, fit, connect, play.