Traffic vehicle sensor Features:

The LD-102 loop detector is an intelligent, extremely flexible and very affordable product.
The LD-102 is Loop detectors in recent years have become a popular tool 
having innumerable applications in policing, right from 
surveillance operations to traffic control. Automation of gates and doors has become a popular usage of the
loop detector.
Self-tuning & complete environmental tracking.
Two-color LED status indicator for Detect, Power, and Loop Fault indication.

Specifications：
LD-102：12-24VADC
Loop Inductance
20-2000μH
Sensitivity
ΔL 0.01% to 2.56% with 16 Selectable Levels
Response Time
8~80 ms 
EURO 11-pin connect