Contact Us Location 5225 Independence Pkwy, Suite 100 Frisco, Texas USA E-mail info@engineeredoptical.com Phone Numbers Office: (469) 909-0121 Fax: (972) 432-5164 Hours of Operation Monday: 9am to 5pm Tuesday: 9am to Noon Wednesday: 9am to 5pm Thursday: 9am to 5pm Friday: 9am to 4pm Closed Saturday and Sunday Return and Warranty Policy