Single Zone Microwave sensors are suitable for convertibles and targa tops as the microwave field is self-limiting, unlike ultrasonic sensors which require a hard surface for reflection. OperationActive Microwave Protection FieldSensor establishes a microwave field. Any measured change in the density of the field is determined to be an intruderTemperature compensative circuitryEnsures sensitivity does not change as ambient temperature rises or fallsSensitivity adjustmentSensor allows installer to adjust sensitivity to provide compatibility with different size vehicles SpecificationsVery Low Current Draw9.07mA when idle, 21.95mA when triggered for 2 secondsWide Operating voltageOperating voltage +9VDC to +15VDCOperating temperature-20 degrees to +85 degrees for equipment designed to be installed within vehicle cabinPolarity protectionThe system circuitry is designed to protect itself against accidental battery polarity reversal. This can happen when replacing the vehicle batteryTrigger output ratingEach output of the sensor can sink 300mA, suitable for energising relay coil when necessaryTrigger output is back EMF protectedClamping diode protects the output driver transistor(s) to stop damage from the super high voltages that occur when a relay coil is releasedCan protect open top vehiclesMicrowave field will not pickup movement of air. The field provides it's own boundaries, so perfect for convertiblesPower ConsumptionEach additional sensor added to a system will increase its over-all power consumption from the car battery. See the list of each sensor's power consumption.Black: (-) Connect to GroundRed: (+) +12vYellow: (-) Connect to instant trigger Aux-negative input of alarm (Alarm) trigger OR (Warning) trigger. ATT: OUR CAR ALARM SENSORS MUST BE FITTED BY A PROFESSIONAL AUTO ELECTRICIAN