3.5" Security Camera Tester TFT Monitor for CCTV CABLES 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 Audio test function, built-in 0.5 speaker, support for audio input / output Built-in rechargeable battery DC3.7V/2200mAh, Automatic charging function