Printing method: hotline printing Bluetooth version: 4.0 Interface: Power Jack, Mini USB Printing Speed: 50 - 89.9mm/s Dots per Line: 384 Dots per Line Paper Thickness: 0.05 - 0.10mm Paper Width: 57 +/- 0.5mm Printing Width: 48+/- 0.5mm Roll Diameter: 25mm Operating temperature: -10 - 50 degrees Celsius Internal characters: ASCII CH (8 x 16, 8 x 17, 9 x 24, 12 x 24); GB18030 (16 x 16, 24 x 24) Print command: ESC/POS compatible with order set Paper Feeding: Easy Loading Paper Black Label Test: Supported - Battery: 1500mAh Li-ion battery (included) Charging time: 2-4 hours Standby time: 100 hours usage time: up to 3 days Power adapter: DC 12V/ 1A Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.