Eoncore 4.3" TFT LED Network Cable Tester CCTV Camera Installation Detection System Security Video Audio Tester Surveillance with OSD Menu This 4.3" security tester is designed for testing the surveillance camera. The security tester can be attached to the surveillance camera in site. It also has OSD menu and network cable testing capabilities. Additionally, it could be used as a power supply of 12V temporarily. The whris strap design is humanized for convenient use Adjustable brightness of screen, 5V USB charging and low power warning It can activate a power-saving mode after 3 minutes of inactivityno video) to enter sleep mode, then you can switch in video to wake it up