The Enforcer 4k Ultra-HD four-camera, 8-channel set from Swann features True Detect that senses heat and motion with reliable alerts, plus powerful night vision up to 130 feet and color night vision up to 32 feet, and the ability to retain video for up to 6 months on the 2TB hard drive. The Swann security app allows you to monitor 24/7. Compatible with Hey Google and Alexa.