GRD (A D.I. Optical Company) warrants these products to be free from manufacture defects in materials and workmanship under normal use and conditions for a period of 5 years from the date of purchase when purchased from an authorized dealer or distributor. Should service be necessary for any reason due to a manufacturing defect or malfunction during the warranty period, GRD (A D.I. Optical Company) will repair or replace the defective merchandise at our discretion. Valid proof of purchase must be submitted to GRD (A D.I. Optical Company) along with the defective merchandise.

warranty will NOT cover:

  1. If the unit has been misused or improperly handled.
  2. If the unit shows any signs of misuse.
  3. If the unit has been repaired or modified by someone other than GRD (A D.I. Optical Company).
  4. The batteries


Return Procedure

  1. Send an email to to obtain a Return Authorization Number (RMA).
  2. Enclose your defective product with a brief description of the problem along with a contact name, daytime phone number and address so we may contact you with any questions we may have regarding your product.
  3. Enclose a photocopy of your original sales receipt for proof of purchase.
  4. Securely pack your product to protect from any damages during shipping and ship freight prepaid to:
    D.I. Optical USA Inc
    16037 Valley View Ave
    Santa Fe Springs, CA 90670
    Attn: RMA Department
  5. Customer is responsible for shipping and insuring the product being returned to the mailing address above.


Please note that we have a right to refuse any package without a RMA number. This number must be written on the outside of the return box along with the completed RMA form inside.
The warranty for international purchases may have a different warranty program. Please send an email to for more details.