Motion detection does not work through windows reliably. Arlo cameras use two different kinds of motion detection, and both types are inhibited by glass, especially windows.

Passive Infrared (PIR)

Passive infrared, the type of motion detection used by most Arlo cameras, detects changes in heat. Most glass used in homes today is insulated, limiting the movement of heat through the glass. PIR is used by Arlo Ultra series, Arlo Pro series, Arlo Go series, Arlo Essential Wire-Free/Outdoor series, Arlo Audio Doorbells, Arlo Video Doorbells, and Arlo Home Security System.

If you are attempting to detect motion outside, we recommend placing your Arlo Wire-Free cameras outdoors.

Pixel Based (Frame-by-frame)

Frame-by-frame comparison is the type of motion detection used by the Arlo Q, Arlo Q Plus, Arlo Essential Indoor Camera, Arlo Essential Indoor Camera (2nd Generation), and Arlo Baby. This type of motion detection sometimes detects false positives due to moving reflections in glass surfaces. Avoid pointing the cameras towards windows, glass, or mirrors.

• Arlo Pro 3, Arlo Pro 4, and Arlo Pro 5S uses frame-by-frame comparison when connected to an outdoor charger with the battery fully charged.
• Arlo Pro 3 Floodlight uses frame-by-frame when the Outdoor Power Adapter is used and the battery is fully charged.