7.Why does the KA13 get a bit hot in operation? Is it normal?

The KA13 is a big output power mini desktop device, so getting a bit hotter than other USB dongle is normal phenomenon. But compared with the KA3, KA13's power consumption is only about 10-20mA higher, and the temperature difference of about 2-3 ℃. After using the KA13 for half an hour the temperature is about 37-40 ℃ and the KA13 will become warm.