If you want just parking sensors, then the ones I had on my traded in Hiace were installed by William Geddes. They cost $375 and that included them coming out to my place and fitting it. Colour coding of the sensors is extra. It gives an audible warning only.
The advantage if the OPS is that the rear of the car is divided into 4 sectors and it gives a visual indication as to which sector an obstruction has been detected in. This is in addition to the beeping that gets faster the closer the object is.
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