A:AnswerHi! The Refresh Rate is 60Hz and the Response Time Gray-Gray is 8ms.
Below, is the link you may use to view further specifications and details regarding this product.
https://westinghouseelectronics.com/product/westinghouse-75-4k-ultra-hd-smart-roku-tv-with-hdr-wr75ux4210-wr75ut4210-wr75ux4200/