This Mindray Probe 75L38EA for Ultrasound is a great addition to your medical equipment. It is compatible with Mindray brand and has a linear array ultrasound probe sensor type with a center frequency of 3.5. It was manufactured in China and can be used for general surgery. This unit type is a unit and comes in a quantity of one. Used does appear to work. Does need some TLC a animal has knowed on the cord in places.