... test. Lithium battery build-in. Speaker build-in test box 2.5" TFT LCD Video Audio CCTV Tester. Video Test, audio test. Lithium ... for displaying video, testing video signal and Testing audio etc. With it, you can do easy and simply on installing and ... Specification ModelCCTV tester JE-BT250Signal modeNTSC/PAL Auto suitableDisplay2.5" TFT LCD Screen, 960x 240 resolutionVideo Input 1 X BNC 1.0Vp-pAudio ...