Model ER-Q2 Dimension 90*120*50mm Print method Line thermal printer Paper width 58mm print width 58mm Weight ( g) 235 (not including the paper roll) Max diameter of paper roll      60mm Dot per lie 384 dots/line internal characters ASCII CH(8x16,9x17,9x24,12×24); GB18030(16x16,24×24) Print speed 50~80mm/s Life cycle time 100km(printing density under 12.5%)/100 million pulses text and graphic Support English, figure, symbol, Chinese, graph, curve, icon pre-stored, barcode(CODE39EAN13EAN8 CODABARCODE128CODE93ITF) QR code ,PDF417 Dot pitch (resolution) 203DPI/8 dots/mm    interface Mini USB, Wifi Power 5000mAh 7.4V rechargeable Lithium battery Recharge adapter Stand by recharging / AC adapter Self-check Without paper / cover open Black mark test Supported Paper feeding Easy paper loading commands ESC/POS compatible with order sets Paper cut By hands operate setting Temperature  -10°C~50°C ; Humidity 20%~85% Recharge Setting Temperature 5°C~40°C; Humidity 20%~85% Storage Setting Temperature -20°C~70°C ; Humidity 5%~95% Standard accessories Long-term preservable paper,AC adapter,li-ion battery,USB cable Optional accessories Serial interface cable/leather coat/CD