PIR motion detectionSomeone receives a ring doorbell, your call and instant notification. You can open the door remotely and communicate with the ToSee app directly on your mobile phone.Echo canceller with real-time and two-way intercom systemThere is a passive infrared sensor built-in video doorbell, which can capture a little. real timeMonitoring is possible. 1 Watch can videos anytime and anywhere without worrying about your phoneDanger opening everyone at home while waiting for the wrong thing door or embarrassment visitor. HD video andWay audio your communication more clear.166 degree wide angle lenInstalled with 166-degree wide-angle len, provide clear and wide view.High definition and night visionClear View Dark just provide the ToSee app and light sensor doorbell to night mode to switch.2.4 1.2ghz Wi-Fi network2.4 1.2GHz Wi-Fi signal range is about 20 meters. You can easily send live video calls to your home and connect to Wi-Fi networks. 1 Watch the can and call the video anytime, anywhere.3 Battery, long standby timeThe doorbell is equipped with 3 18650 batteries.Charging time: 14 hours. Can use 1A USB charger (microport via doorbell).Please save the 18650 battery completely before using.The battery is three to four under normal use for three months (5 minutes). Also used in frequency dependent doorbells.Real-time display: up to 30 hoursFamily connection and real-time sharing4. The image of the mobile phone doorbell could be shared at the same time, only one user could talk directly to the intercom. Compatible with iOS 7 and Android operating system.