Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
The baby unit is not a wireless one which is sometimes difficult to find a proper place for that. The parent unit keeps the battery charge maximum 4 hours which is not enough. The camera works well specially, gives good angles of the picture. Night vision is good enough to see your baby's condition