A9 Very silent printing thru direct thermal printing method High speed (50mm/sec, based on character ratio 25%) High speed and low power consumption option Support 3.3v low voltage system Support 3.5v-9v power (best performance when 7.2-8.5v) Serial(rs-232c , ttl) interface/parallel interface Abundant figure/curves/characters print function Easier paper loading Itemspecification Printing methoddirect thermal line printing Paper out detectionpaper end sensors function Paper loading wayeasy paper loading Paper width57 mm Print width48 mm Resolution ration8 dots/mm(384 dots/line) Life of printing head6+106 character lines Printing speed50mm/sec (when the character ratio is 25%) Character 6x8dots , 8x16dots, or12x24dots Chinese character librarygb2312, 16x16dots, or24x24dots Outline dimension(wxhxd mm)84mmx98mmx57mm Installation dimension(wxh mm)78mmx92mm Inlaid deepness54mm Paper suppliedthermal roll paper (57mm wide, 50mm°) Interfaceserial(rs-232c , ttl)/parallel interface Input powerdc 3.5v-9v, 15w/ dc 5v, 3a Operating temperature5¦c ~ 50¦c Storage temperature-20¦c ~ 60¦c Operating humidity10¦c ~ 80¦c Storage humidity10¦c ~ 90¦c