If you're using POS on multiple devices and they do not communicate with each other, it means they do not sync. (Example: On a tablet, you issued the tax bill and on the other tablet the table is still open, with green color).

To check synchronization between devices, follow these steps:

Step 1:

At the upper left icon, the one that resembles an atom, should show you at least the figure 1 next to it. The figure that appears must comply to the number of devices your device views. Always the same number should appear on the devices. (Example: we have 2 tablets and figure 1 must appear, because tablet I only syncs with tablet II.)
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If the number does not match the device sync, click on this icon, then choose Search devices.

​Step 2:
Shut down and restart the wifi on the device. If you have a computer, you can directly remove the Internet cable from it, then re-enter it. You can also close and reopen the internet router or the device.

Step 3:

Check that devices are connected to the same Internet network, have the same IP. Click on the icon with 4 horizontal lines at the top left of the page, then on the bottom of the page you'll see the IP.
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To have the same IP, the devices must have the first 3 groups of identical figures - 192.168.0, only the last group differs.

Step 4:

Check to be the same version of the application on both devices. Click on the icon with 4 horizontal lines at the top left of the page, then on the bottom of the page you'll see the version of the application.

​Step 5:
Synchronize the device manually by going to the 4-line horizontal icon at the top left of the page. Touch POS Settings - Sync device.