Ultrosonice Sensor deted, Display Speed in LED light light sensor alarm. louder speaker alarm ... core, easy to change different warning sound.• Two level speed setting, level-1 with flash lamp warning, level-2 ... can be adjusted from 0 to 99 seconds, if speed of forklift exceeds the preset, will warn.• Eight-level ... voltage: DC12V ~ 24V.• Consumption power: 5W. forklift over speed alarm automatic alarm