The Vehicle Loop Detector is mainly used to detect the existence and passing of vehicles;Reset Switch: The reset switch enables the detector to be manually reset during commissioning and testing. This results in the detector re-tuning the sensing loop and becoming for vehicle detectionSelectable Time: This feature sets the length of time the relay will be energized for 1 Second or 0.5 Seconds; Relay : The Relay may be configured to energize on detection of a vehicle or when the vehicle leaves the loopSensitivity Boost : This feature sets the undetected level to maximum sensitivity and is used to prevent loss of detection of high-bed vehiclesSwitch Selectable Sensibility: 4 sensitivity setting are available on the switches to allow flexibility in configuration;Switch Selectable Frequency: 4 frequency settings are available to prevent -talk between adjacent loopsFilter Option: This option is used to a delay between detection of the vehicle and switching of the output relay . This relay is normally used to prevent detection of small or fast moving objects;Permanent Presence Option : This feature detection of the vehicle will be maintained when the vehicle is parked over the loop for extended periods.Specifications:Supply voltage:220V AC:4.5VAOutput relays:240V/5AOperating temperature:-20~65 Celsius temperature:-40~85 CelsiusFrequency range:20 kHz to 170 kHzTemperature compensation:50 Celsius/ hReaction time:10msSignal holding time:Unlimited/limitedSensitivity:Higher:0.02%/high:0.05%/low:0.1%/lower:0.5%Loop inductance: loop plus connection wiring:50H to 1000H. perfect is 100H to 300HLoop connection wiring:200 meters long. The resistance is less than 80hm, twisted at least20 per meterRelative humidity:Less than 90%No condensationWeight:283gColour:blackMaterial:Plastic + metalPackage Contents:1 x Vehicle Loop DetectorOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.