GENERALFEATURESSPECIFICATIONS一般功能和规格AR-819ThreeStagesLEDindicationFor CarParking三种颜色Led停车提示AudioIndicationForCarParking 停车声音提示GreenLightForCarParking 5米距离绿灯提示YellowLightFor5MetersIndication 5米距离黄灯提示RedLightAndAlamSoundOnFor0.5MIndication 0.5米距离红灯及警报提示DifferentLightCorrespondingDifferent BiBi sounds不同灯对应不同声音提示UltrasonicFrequency38.5-50khz超声波频率AutoCaliberationWhenPowerOn 开机自检功能LowBatteryIndication 低电显示