Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
This product is horrible! Do not waste your money on it. The directions on the use of it are terrible and hard to understand. When I received it there was several parts missing. I managed to find replacement parts but I still have not been able to make it work. And I had difficulty contacting the seller.