XP-P810 has patented function: Patented function: Power charging by power bank/computer Long lasting battery life(Up to 2000mAh) Support IOS app and Android device connection Support Bluetooth and Wifi connection Large paper roll capacity(diameter 50mm) Compared to the traditional thermal receipt printer, this mini printer has built-in rechargeable 2000 mAh lithium ion, standby time can reach 7 days, which make a great convenience for you. Once you charge the printer, you can use it for a long time, and you don’t worry about the battery. With paper run out and power empty alarm, which makes it smarter to users, especially in the noisy situation, minimize work errors as much as possible. With dual mode of Bluetooth, transmission distance can reach 10m, which is handy in your life.