4.3 TFT LCD Audio Video Security Tester Cctv Camera Cam Test Monitor Portable Power by 4800MAH Battery , Video-in terminal and DC power supply High 4.3 Inch image resolution monitor enable to show clear image Long work time Hand-hold design for professionals.Easy operation without taking off gloves speeds your works It's convenient for user to check camera condition and correct direction of camera, so to make installation and repairing easier.