SwitchBot Motion Sensor can detect body movement across a more comprehensive area range of up to 30 ft, at an angle of up to 110¡ã horizontally and 55¡ã vertically. With built-in light sensor, you can also define your light threshold to be bright or dark via our app. What's more, SwitchBot Motion Sensor works perfectly with Echo devices when connected to SwitchBot Hub Mini. Alexa can automatically alert you when Motion Sensor detects movement wherever it¡¯s placed.