Customer reviews

4.4 out of 5 stars
4.4 out of 5
21 customer ratings
5 star 71% (71%) 71%
4 star 9% (9%) 9%
3 star 14% (14%) 14%
2 star 7% (7%) 7%
1 star 0% (0%) 0%
How does Amazon calculate star ratings?