Print method: Thermal line printing Effective print width: Max=72mm, 576 dots Print speed: Up to 90mm/sec Resolution: 8 dots/mm(203dpi) Paper dimensions: 79.5.±0.5mm x diameter 50.0mm Paper thickness: 0.05 to 0.12mm Interface: USB type-C (optional)and Bluetooth Flash: 8MB DRAM and 8MB Flash memory Power Adapter: 5V DC/2A Charging time: 4-5 hours Battery Power: 2500mAh, 7.2V 18Wh Working time: 5 hours continuous, 7 days standby time Printer head life: 50 KM Working conditions: Temperature: -10~50 degC, Humidity: 10%~90% Weight: Net weight: 0.357kg/Set