Customer reviews

4.1 out of 5 stars
4.1 out of 5
3 customer ratings
5 star 37% (37%) 37%
4 star 37% (37%) 37%
3 star 26% (26%) 26%
2 star 0% (0%) 0%
1 star 0% (0%) 0%
How does Amazon calculate star ratings?