Multi functional CCTV tester   Portable tester with 3.5 inch TFT display(video input and out put) Auto identity NTSC/PAL Power-saving mode can display in a standby state Small appearance, highly integrated and practical Audio test function, built-in 0.5 speaker, support for audio input / output Support DC12V output, charging for camera. Built-in rechargeable battery DC3.7V/2200mAh, Automatic charging function Power supply: Battery-powered, computer USB port power supply, DC5V/2A adapter power supply Particularly suitable for project installation of the camera effects, the lens range, the lens view angle, etc. adjust positioning, saves time and effort, convenience