Specification: Printing Method Thermal Line Resolution 8 dots/mm, 384 dots/line Effective Printing Width 48mm Printing Speed 50-80mm/s Character Set ASCII, GB18030(Chinese), BIG5 Print Font ANK: 12 x24, 9 x24 Chinese: 24 x 24 Self-defined Character Yes Barcodes EAN-13, EAN-8, UPC-A, UPC-E, CODE39, CODE93, CODE128, CODABAR, INTERLEAVED 25 Driver Windows XP/Windows Vista/Windows 7/IOS/Linux Graphic Support bitmap downloading Paper End Sensor Yes Overheating Protection Yes Black Mark Location Yes Auto Sleeping Yes Interface USB + Serial + Bluetooth Battery DC7.4V,1.5A rechargeable Li-ion battery Charger DC9V/2A Printer head life 50km Paper Type Thermal paper Paper Width 57.5± 0.5mm Paper Thickness 0.06 to 0.08mm Paper Roll Diameter 40mm (Max.) Paper Supply Method Drop-in Easy loading Paper Cutting Method Manual Operating Temp/Humidity 0-50°C/10%-80% Storage Temp/Humidity -20-60°C / 10%-90% Dimension (L x W x H) 105 x 75 x37mm