 Industrial design  Advanced ultrasonic detect mode  The advanced way of detection is used. the misforecast question caused by the outside disturbance or the environment changing is hard to be happened like the other detection way of infrared way or microwave ;  With Highly Anti-disturbance capability to avoid wrong judgment.  Easy to install and maintain.  The adjustable height range is 1.0m to 3.5m.  The height brightness diode indicator light indication detective status;  1S or 5S of sign output delay can be choosing through the outer switch. 3. Technical data:  Operating Voltage: 12VAC  Operating temp.: -20℃ to 65℃  Storage temp.: -40℃ to +85℃  Operating relative humidity: 30%-90%  Used condition: installed on the parking lot it usually installed with the probe down in ceiling in a way of suction top.  Shell dimension: diameter10㎝ × height 4.5㎝  weight :140g  Height range 1.0-3.5m (adjustable)