I came across the product recently as well and found the official product page useful for getting a basic overview: https://zaruba.tech/products/zaruba-a3-drone-detector. I think the main advantage of checking the manufacturer’s information first is that you can understand the intended purpose and specifications without relying on random marketplace descriptions. When comparing drone detection equipment, I would personally look at the detection approach, portability, interface and general operating requirements rather than focusing on one specification alone. Different users can have completely different priorities, so it is worth checking the details carefully and deciding whether the device matches your particular use case. I would also compare it with a couple of alternatives before making a final decision.