Motion detection not working from inside to outside

[Mohmoh]

I have put a camera on the inside of the house on window sill but it's not picking up any motion outside. Why does it not work through window ps I have had in the past swann cameras in exact same place and worked perfect

[TomMac]

The Arlo cameras work on PIR detection and WILL NOT work thru glass as glass blocks the IR the use to detect motion,

( except the Q cams and Baby which use changes in the pixels; actual picture )