Printing method: Direct printingBluetooth version: 4.0Interface: Power jack. Mini USB Print speed: 50-89.9mm/s Dots per line: 384 dots per line Paper thickness: 0.05-0.10mm Paper width: 57 +/- 0.5mm Print width: 48+/- 0.5mm Roll diameter: 25mmOperating temperature: 10-50 degrees CelsiusInternal 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 setPaper feed: Easy paper loadingBlack mark test: Supported Battery: 1500mAh Li-ion battery (included)Charging time: 2-4 hoursStandby time: 100 hours usage time: up to 3 daysPower adapter: DC 12V/ 1A About shipping: All items will be shipped within 3 business days after payment is received. Most of the time you will receive them within 8-12 days then. The specific delivery time depends on circumstances. If you have any questions, please do not hesitate to contact us. During the shopping process, if you have any questions, please do not hesitate to contact us, we will reply to you within 24 hours, wish you a happy shopping. Thank you for your cooperation and we will make you satisfied.