... 4.RS232,RS422,RS485,PTZ CCTV CAMERA TESTER 3.5-Inch TFT LCD CCTV TESTER PRO With High Stability Digital Multimeter MODELSC ... from controlling devicePOWERPower AdapterDC5V, 2ABatteryBuilt-in 3.7V Lithium polymer battery ,3000mAhRechargeableAfter charging 3-4 hour, working time lasts 12 hoursLow ... Multimeter Hot !!! Low price !!! 3.5-Inch TFT LCD CCTV TESTER PRO With High Stability Digital Multimeter