Dear :

Thank you for your letter of [date]. We are pleased to learn that you are satisfied with our new [product].

As to your request for [technical information], I am afraid we cannot provide you with the details. This kind of information is proprietary and cannot be released to anybody outside the company. I hope you will understand our position.

We have tried to included in the User's Manual all the necessary information for our customers. If you need any further help, you are always welcome to use our 24-hour On-line Technical Support System. Just dial and you will get free technical help from our professional staff.

Thank you for selecting [company]. Please feel free to call me if you have further questions.

Sincerely yours,

[name]

[title]