Customer reviews

3.4 out of 5 stars
3.4 out of 5
21 customer ratings
5 star 40% (40%) 40%
4 star 9% (9%) 9%
3 star 18% (18%) 18%
2 star 18% (18%) 18%
1 star 14% (14%) 14%
How does Amazon calculate star ratings?