... : 48mmResolution ration: 8 dots / mm ( 384dots / line)Life of printing head: 6,000,000 characterPrinting speed: 50 mm/ sec ( when the ... , 8 x16 dots, or 12 x 24 dotsChinese character library: GB2312, 16X16 dots, or 24x24 dotsPaper supplied: Thermal roll paper ( 57mm wide ... Humidity: - 20 degree ~ 60 degreeStorage humidity: 10 degree ~ 90 degreee Thermal Printer Mechanism with System Control Board