Features:   1. Paper out detection: When the paper is out of paper, the printer function indicator (red light) will flash, and the buzzer will prompt at the same time.   2. The wireless portable printer uses thermal printing, no ribbon, and high cost performance.   3. The wireless portable printer supports wireless connection to desktop, laptop, mobile, and pad.   4. It has the functions of automatic sleep, automatic wake-up, energy saving, and extended use time.   Description:   80mm/sec graphic character speed printing, clear printing, fast printing speed and high work efficiency.   Specifications:   Printing method: line thermal   Printing paper width: 57±0.5mm   Printing width: 48mm   Resolution: 8 dots/mm (230dpi)   Points per line: 384 points   Printing speed: 50-80mm/s   Paper roll diameter: 40mm   Interface: USB micro interface; 2.0 wireless + 4.0 wireless   Working temperature: -10~50   Working humidity: 20%~85%   Storage temperature: 15~20   Storage humidity: 45%~75%   Power supply: 1500mA rechargeable lithium battery   Adapter: input: 220v 50HZ, output: 5V, 1A   Appearance size: 105*78*47mm   Support system: for Android, IOS, Wince, symbian, Windows system   Package Included:   1 * Printer   1 * Adapter   1 * Charging Cable   1 * Printing Paper   1 * Manual   Notes:   1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.   2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.