Need to keep an eye on employees, your home, or your property? The QS494 has the ideal professional features for easy do-it-yourself surveillance. This 4-channel multiplex DVR uses advanced technology to produce high-quality video, offering H.264 video compression, which compacts video file size, preserves quality, and maximizes recording time. Choose CIF or D1 recording, and get smooth continuous video motion in return. Record using motion detection mode (includes email alerts), schedule or manual mode, and stay connected by backing up or transferring your video footage to a PC, USB flash drive or hard drive. The DVR's multiplex feature allows you to simultaneously record, view live or recorded footage, play back footage, back-up files and remotely monitor and manage your DVR without any recording loss. Don't wonder what's happening while you're away - see for yourself on your compatible Smartphone, PC, or Mac computer. Q-See offers a mobile surveillance feature that lets you easily view your cameras' live feeds via the Internet or your Supported 3G/4G Smartphone.