You can easily take the Saalio device with you on flights. It won’t cause any problems at security and can usually be carried in your hand luggage.
The Saalio device does not contain any batteries and is therefore not subject to the special regulations for electronic devices with lithium batteries. There are usually no difficulties at customs either. The device is part of your ongoing healthcare and must therefore be taken with you when you leave the country.
The supplied mains adapter is a so-called universal power supply. It works worldwide with all standard voltages (100–240 V) and frequencies (50–60 Hz), so a voltage converter is not necessary. You simply need a suitable plug adapter for the sockets in the country you are visiting.