1 Main Functions and Features of led indicator:
1) Show the parking information to the driver by its color, it will
turn from green to red when it occupied, or it will keep green
2) Install LED indicator in the front of car park space for the convenience of driver? observation.
3)One park space needs one LED indicator. 

2  How parking guidance systems / led parking indicator work
Firstly, UD takes use of ultrasonic wave to detect the car space to see if it is occupied by vehicles and transfer relative command to LED indicator which will turn from green to RED when occupied, or it will keep GREEN; Meanwhile, the UD transmit its status message to ZCU immediately, and ZCU will collect and forward the information to CCU;
CCU processes these data and sends the relevant command to ZCU and LED panel.

3 Product details:
Type: Carport
Place of origin: Fujian, China
Brand name: Keytop
Model number: Key-b02
Current rating: 3.5mA
LED luminance: 9000mcd
LED luminance(RED): 5000mcd
LED number: 6RED+6Green/Blue
Shell: ABS
Working temperature: -50C--+80C
Visual angle: 360°
Visual range: >50m
Type: LED indicator