Very small. There are two cooling modes: normal quiet and turbo. The magnets are not strong enough to hold the phone well on large bumps. But in any case, this is one of the first chargers with the 2.2 standard. In navigation mode, the phone does not discharge as it did with the old regular charger.
I liked the quality, tested the charging on a Samsung S25 Ultra phone, which supports 15W charging according to the specifications, used the phone's original 45W charger, and got 20W wireless charging, a pleasant surprise. The magnet holds the phone well, the fan is not audible even at maximum power, and there is documentation in Russian.
The quality of the plastic is not very good: after a month of normal, careful use, 3 out of 4 clips holding the Qi2 coil broke.