1.SUPPORT FOR VGA INPUT: The display of this multi functional CCTV tester supports VGA input and HD display interface input. You can use a monitor and DVR to work together conveniently and quickly. 2.3IN DISPLAY SCREEN: The CCTV test monitor has a mini 3in display screen, which is protected by film and rubber on both sides, allowing you to use it in different environments. 3.EASY TO USE: A mini CCTV monitor suitable for CCTV systems can ensure that you complete your work faster and better. Large capacity batteries can make CCTV monitors work for a long time and are easier to replace. This monitor has a 12V DC power output, and in cases where it is difficult to provide independent power, you can power the camera separately. 4.POWERFUL FUNCTION: The tester can perfectly test up to 8MP AHD cameras, for TVI cameras, and for CVI cameras, making it perfect for upgrading old CCTV analog signal systems. The CCTV tester also supports UTP cable testing, 5.EASY CARRYING: Comes with a small size and a light weight as well, easy to carry the tester around for convenient use.