Product Name: Imperial Units 8 Sensor Parking Sensor,with Learning Function for Vehicle with Spare Tire , Tow Bar or Bike Holder, Special for SUV ,Station Wagon,Pickup Trucks Certification: CE Type: Parking Sensor Trademark: TIPI Transport Package: OEM Color Box Specification: CE Origin: China Product Description Anti-false alarmLearning functionAutomatically identify spare tyre or tow-bar without false warning, remember it as part of the vehicleDifferent alarm sounds can remind the nearest obstruction lies on front or rearFront sound: BoBoBo Rear sound: BiBiBiOne LED display and one control unitOpposite indication on display represents front or rear directionFront and rear sensors for full front and rear coverageDisplay with built-in buzzer and alarm sound ON/OFF switch4, 6, 8 sensors is optionalRated voltage: 12V DCOperating range: 9-16VWorking temperature: -30~+80 degree CelsiusRated current: 20~200mAUltrasonic frequency: 40KHzDetective range: Front: 0.3 ~ 0.8m Rear: 0.3 ~ 1.5m