Zmodo 4 Channel Complete Security Solution with 500GB Hard Drive, 4 600TVL Hi-Resolution Night Vision Indoor Outdoor Cameras and Free Mobile Apps Developed and designed for the needs of numerous end-users, this advanced 4 channel surveillance system has improved camera resolution to 600TVL, while still being affordable. This Zmodo Series Security Solution allows you to maintain your busy lifestyle while enjoying peace of mind knowing that your home, family, business or employees are safe and secure. This advanced 4 channel complete security solution with 4 hi-resolution (600 TVL) night vision cameras that is fully controllable on your Smartphone, Tablet or PC. With motion activated push notifications, email alerts and easy Smartphone access, this Zmodo surveillance system gives you true, 24/7 day or night, video security no matter where you are located in the world. Free Mobile Apps