Compare 1080p vs 2K vs 4K security cameras by image quality, viewing distance, storage, bandwidth, night vision, and real-world home security needs.

Learn how much storage security cameras need for 24/7 or motion recording. See practical storage estimates, formulas, examples, and tips for choosing SD cards, NVR drives, or cloud storage.

Can security cameras work without internet? Learn how SD cards, DVRs, NVRs, PoE systems, and cellular cameras work offline and which features stop working.

Learn how security cameras work, including how they capture video, detect motion, transmit footage, store recordings, use night vision, and send alerts.

Learn where to place security cameras around your house for better coverage of doors, driveways, garages, side gates, and backyards while protecting privacy.

Learn how to change the battery in a DSC or other-brand motion detector safely, identify the right battery, stop tamper alerts, and test the sensor after replacement.