Specification Brand : Wikene BulletPoint1 : 16MM size: 16MM long, 12MM high, with a distance of 10MM between the legs BulletPoint2 : T represents emission. R represents reception. BulletPoint3 : The black circle on the pin is positive, and the other one is negative when connected to the casing BulletPoint4 : Packing: 20PCS BulletPoint5 : The part with T is thNote: 1. Please allow 1-2cm errors due to manual measurement. 2. Due to the difference between different monitors, the pictures may not reflect the actual color of the item.e Transmitter; the part with R is Receiver Color : 20PCS Transmit 25KHZ ExternallyAssignedProductIdentifier : 5303396714694 ExternallyAssignedProductIdentifier1 : 0763523213042 ExternallyAssignedProductIdentifier2 : 763523213042 ExternallyAssignedProductIdentifier3 : 7440105624207 ExternallyAssignedProductIdentifier4 : 00785901603719 IncludedComponents : 20PCS ItemName : 20pcs 25KHZ 16MM Transmit Receive Ultrasonic Open Sensor TCT25-16T/R (Split Type) Probe 16mm 25khz ultrasonic Drive Dog Wikene (20PCS Transmit 25KHZ) ItemPackageDimensions_Height : 9.6012 centimeters ItemPackageDimensions_Length : 3.2004 centimeters ItemPackageDimensions_Width : 7.7978 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : ultrasonic-proximity-sensors Manufacturer : Wikene Material : copper MaximumRange : 1500 meters ModelName : LiebeWHer5o1it8yu ModelNumber : 3-01-0622 NumberOfItems : 18 PartNumber : Wikene PowerSourceType : Corded Electric ProductDescription : 20pcs 25KHZ 16MM Transmit Receive Ultrasonic open sensor TCT25-16T/R (split type) probe 16mm 25khz ultrasonic drive dog Wikene ProductSiteLaunchDate : 2014-07-24T13:34:45.529Z SupplierDeclaredDgHzRegulation : not_applicable UnspscCode : 46171600