Hi,
Yes, Elementary POS supports this feature. You simply need to use any Android phone or tablet, install the Elementary POS app, and switch it to the order display mode. Anything added to the bill on the main register (or sold, depending on the settings) will instantly appear on this order display.
You can also connect a printer to the order display to print the orders. The printer must be a standard POS receipt printer (Bluetooth or Wi-Fi). However, we don’t have experience with printers that print stickers.
If you have a specific printer in mind, please send us the specifications and we will check whether it could work.