The LQ-590II offers an enhanced USD mode (Ultra Speed Draft) of 550 characters per second at 10 characters per inch. This makes it the ideal choice for large print volumes, such as inventory reports and bulk printing of invoices or shipping documents. Maximum print speed: 550 characters per second, character spacing: 10 characters per inch, maximum number of copies: 7 copies. Print heads: 24-pin. Media types for the standard paper feed: envelopes, labels, plain paper, roll. Continuous paper thickness range: 0.065 - 0.49 mm, label thickness: 0.16 - 0.19 mm. Buffer size: 128 KB. Standard interfaces: Parallel, USB 2.0.