[The built-in machine is 57X30mm roll paper]The machine is compatible with label paper and sticker paper, but it needs to be purchased additionally on Amazon [mini printer bluetooth connection app]Bluetooth 4.0 connection. Connected to the ""APP through Bluetooth, without wire. System: for android 4.0, for iOS phone 8.0 or above. Press the gray button on the side of the printer for 3 seconds to turn on the printer before connecting to Bluetooth. [Paper width 57X30mm and minimalist design]simple stylish shape, mini & small pocket printer Paper width, The paper cannot be left in the sun, otherwise the words or images will be weakened. [High-quality and clear printing effect]A number of QR code and sticker templates, the printing algorithm is optimized, the paper fits closely, and the mini printer is of and easy to use for smartphone print. [Multifunctional mini mobile printer suitable for multiple scenarios]The small printer can connect to your smart phone, pictures/photos/stickers/logo/travel/work/to-do/note/receipt/business/home/machine/office/logo/QR code/thermal printer to accompany your child kids, a great gifts for your child play. Colour:White Material:ABS Size:8.31 x 8.31 x 4.06 cm Package Contents: 1 x Printer 1 x Printing Paper 1 x USB cable 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.