... , controlling PTZ, generating images, capturing data of RS485 and tes Security CCTV tester2.5"TFT-LCD , 960H×240VresolutionColorbar Video signal generator, transmit ... .7V DC2800mAh), more reliable, and work 9 hours SpecificationMODELST89B-4 CCTV Security TesterLCD adjust Adjustable brightness, contrast, color of LCDSignal modeNTSC/PAL ...