Ideally, the information is entered in the «echo charlie» app via a touchscreen, like a tablet or smartphone. However, input is also possible via desktop browsers and external devices, such as Wi-Fi buttons and USB foot pedals. Push notifications can also be received on these devices, as well as on smartwatches like the Apple Watch.
Basically, «echo charlie» is compatible with any device that can connect to the internet and has a user interface. This means that no investment in additional and expensive hardware is needed.