An NLS digital cartridge with a USB connector and separate special USB cable is an alternative to using a USB flash drive to download digital talking books. 

A separate special USB cable is required to connect the cartridge to a computer during the download/transfer process.

The cartridge and cable are available for purchase from a number of vendors including:

American Printing House for the Blind, Inc. (APH)
1839 Frankfort Avenue
P.O. Box 6085
Louisville, KY 40206-0085
(502) 895-2405
800-223-1839 (Toll-free customer service in the U.S. and Canada)
www.APH.org
Contact: Customer Service
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Howell Mobility Products
717 Louis Avenue
Royal Oak, MI 48067-4603
(248) 548-1788
(248) 548-1788 Fax (call first)
www.howellmobility.com
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National Federation of the Blind
Independence Market
200 East Wells Street at Jernigan Place
Baltimore, Maryland 21230
www.nfb.org
(410) 659-9314, extension 2216
(410) 685-2340 Fax
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Perkins Products
175 North Beacon St
Watertown, MA 02472
(617) 972 7308
(617) 926 2027 (fax)
www.perkinsproducts.org,  Talking Book Accessories section
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Twin Ports Low Vision Center
Duluth Lighthouse for the Blind
4505 W. Superior Street
Duluth, MN 55807
218) 624-4828 Ext. 119
(800) 422-0833 (toll free)
(218) 624-4479 Fax
http://www.lighthousefortheblind-duluth.org/lvstore/

Vistas
Braille Institute
741 North Vermont Avenue
Los Angeles, CA 90029
(323) 663-1111, Ext. 1245
(323) 663-0867 Fax
www.brailleinstitute.org