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.
I bought it in India and when I used in Australia, it does not stay connected and have to push it again and again to keep it stable. So, it does not gather the power supply and makes creaky noise when connected and looses connection and gives a feel of vibration when in use.
Poor product, do not buy these. Rather buy in Australia, you will get better ones at the same or lesser price. I am unable to return as I am in Australia and the return period has expired when I am back now.