Built-in rechargeable battery supports enduring working time<br />Ideal for Android-based apps which need the function of printing<br />Direct thermal printer uses thermal paper instead of ink and is typically smaller, quieter, faster, and more energy-efficient than dot-matrix printer<br />Small size and light, which is easy to carry for out working, such as the taxi bill printing, administrative fees receipt printing, post receipt printing, restaurant ordering information printing, etc<br />Black Print Speed: 90 mm/sec, Max Paper Size: 58mm ">