ARLO ARLO PRO/ULTRA SERIES Noise At Night
System Nominal
The clicking sound is the mechanical actuation of the Infrared Cut-off Removable (ICR) filter. This filter is moved by a solenoid-driven arm to switch between daylight (IR-cut) and night vision (IR-pass) modes; at night, fluctuating light levels, motion detection 'wake' events, or the camera's own IR LED reflections trigger this physical movement, which is audible in quiet environments.
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