Model Number: WH-E33 thermal printer Brand Name: WH,Brightek Key Specifications/Special Features: Please refer to the table below ItemsSpecificationsPrinting methodDirect thermal line printing Paper width 57mm Print width 48mm Resolution ratio 8 dots/mm(384 dots/line ) Life of print head 50km Printing speed 60 mm/s character size 9x17dots,or 12x24dots Chinese character library GB2312,16X16dots, 24x24dots Paper supplied Thermal roll paper(57mm wide, ￠30mm) Interface Serial RS232/TTL/485/Parallel interface Input Power 5.0-8.5V, 3A/9.0 - 24V, 30W Operating temperature 5 - 50°C Storage temperature -20 - 60°C Operating humidity 10 - 80% Storage humidity 5 - 95%