[ Reliable Motion Detector Alarm ] This motion sensor with high sensitivity has a detection distance of up to 39 Ft, a view angle of 110, loud volume at 110dB, and there are two detecting windows in case theres a blind spot. Just install it at a height of 6.5 ft with the screws and you can get an alarm when there is someone in your house. Note: it will avoid false alarms caused by pets whose weight is less than 15KG (33 lbs), such as cats, dogs, etc. [ Remote Control Via the Phone APP ] The motion sensor alarm can set off an alarm by itself, and it can connect to the phone App, which allows you to get the alarm notification and control your sensor even away from home. There are many additional functions on the phone App: 4 work modes (include SECRET mode), 7-day memory function, adjustable sound duration, scheduled working times, etc. [ Operated by USB Power ] Don't worry about the battery lifetime which this sensor will be operated by the AC power. Support the adapter DC 5V 1A. [ Expandable & Sensor Naming Custom ] Adding more sensors to your security alarm system and sensor can work with multiple phones and will provide more safety for your property and your loved ones when met with an emergency. This indoor motion sensor alarm is usually used for rooms, garages, basements, even a covered gate. With multiple sensors, you can name the sensor based on its location, letting you know which sensor is setting off the alarm when your phone App receives an alarm notification.