1.Adopt stepless speed, humanized zoom speed automatic 2.matching technology 3. the lowest manual speed is 0.5 o/S ,smooth o ST8509 IR High-speed Dome Camera Characteristics function introduction1.Adopt stepless speed, humanized zoom speed automatic matching technology2 the lowest manual speed is 0.5 o/S ,smooth operation, cruising speed at most 180o/S accurate position3.fan control temperature,4 ...