Does the X1 detect motion through a window?

No, the indoor home security camera cannot detect motion through glass or a window. The X1 Security Camera is intended for indoor use only. It uses PIR (Passive Infrared) which only detects heat sources like people and pets to trigger its motion detection alert to reduce irrelevant motion events including passing cars or fan blade movement. However, infrared light does not pass through glass, so motion outside of the window will not trigger the X1’s PIR sensor.