Customer reviews

4.5 out of 5 stars
4.5 out of 5
2,331 customer ratings
5 star 77% (77%) 77%
4 star 9% (9%) 9%
3 star 5% (5%) 5%
2 star 2% (2%) 2%
1 star 7% (7%) 7%
How does Amazon calculate star ratings?