Customer reviews

4.7 out of 5 stars
4.7 out of 5
639 customer ratings
5 star 85% (85%) 85%
4 star 9% (9%) 9%
3 star 3% (3%) 3%
2 star 1% (1%) 1%
1 star 2% (2%) 2%
How does Amazon calculate star ratings?